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Magnetochemistry
Volume 5
Issue 2
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Magnetochemistry, Volume 5, Issue 2 (June 2019) – 18 articles

Cover Story (view full-size image): Modulation of the ordering temperatures in anilato-based heterometallic 2D ferrimagnets is possible by simply changing the solvent used in the synthesis of these honeycomb layered magnets. Thus, in the series of magnets [MnCr(C6O4Cl2)3]-, the magnetic ordering temperature can be finely tuned from 9.8 to 11.2 K by simply changing the benzene-derivative solvent used (PhCl, PhBr, PhI, PhCH3, PhNO2 and PhCN) either pre- or post-synthetically. View this paper.
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17 pages, 6643 KiB  
Article
Effect of Magnetic Field and Aggregation on Electrical Characteristics of Magnetically Responsive Suspensions for Novel Hybrid Liquid Capacitor
by Kunio Shimada
Magnetochemistry 2019, 5(2), 38; https://doi.org/10.3390/magnetochemistry5020038 - 21 Jun 2019
Cited by 3 | Viewed by 3225
Abstract
Magnetically responsive fluid based on polymers of natural rubber (NR-latex) involves a magnetic compound fluid (MCF) rubber liquid. For a wide range of engineering applications of suspensions or liquids with particles, their electrical characteristics of fluidic suspensions are investigated to obtain useful results [...] Read more.
Magnetically responsive fluid based on polymers of natural rubber (NR-latex) involves a magnetic compound fluid (MCF) rubber liquid. For a wide range of engineering applications of suspensions or liquids with particles, their electrical characteristics of fluidic suspensions are investigated to obtain useful results that might be important in the study of devices, such as fluidic sensors and capacitors. The author of the present paper proposes that MCF rubber liquid can be produced by combining MCF and rubber latex. The influence of the aggregation of magnetic particles and rubber molecules on electrical characteristics under a magnetic field was investigated by measuring electrical properties under an applied voltage. The electrical characteristics change with a linear or a nonlinear response, based on conditions of particle aggregation. The capacity of the electric charge also changes with the conditions of particle aggregation. These results show that MCF rubber liquid is a novel hybrid capacitor. Full article
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21 pages, 5382 KiB  
Article
Iron(III) Azadiphenolate Compounds in a New Family of Spin Crossover Iron(II)–Iron(III) Mixed-Valent Complexes
by Wasinee Phonsri, David S. Macedo, Barnaby A. I. Lewis, Declan F. Wain and Keith S. Murray
Magnetochemistry 2019, 5(2), 37; https://doi.org/10.3390/magnetochemistry5020037 - 12 Jun 2019
Cited by 7 | Viewed by 4293
Abstract
A new family of mixed valent, double salt spin crossover compounds containing anionic FeIII and cationic FeII compounds i.e., [FeII{(pz)3CH}2][FeIII(azp)2]2·2H2O (4), [FeII(TPPZ)2 [...] Read more.
A new family of mixed valent, double salt spin crossover compounds containing anionic FeIII and cationic FeII compounds i.e., [FeII{(pz)3CH}2][FeIII(azp)2]2·2H2O (4), [FeII(TPPZ)2][FeIII(azp)2]2]·H2O (5) and [FeII(TPPZ)2][FeIII(azp)2]2]·H2O·3MeCN (6) (where (pz)3CH = tris-pyrazolylmethane, TPPZ = 2,3,5,6, tetrapyridylpyrazine and azp2− = azadiphenolato) has been synthesized and characterised. This is the first time that the rare anionic spin crossover species, [FeIII(azp)2]−, has been used as an anionic component in double salts complexes. Single crystal structures and magnetic studies showed that compound 6 exhibits a spin transition relating to one of the FeIII centres of the constituent FeII and FeIII sites. Crystal structures of the anionic and cationic precursor complexes were also analysed and compared to the double salt products thus providing a clearer picture for future crystal design in double spin crossover materials. We discuss the effects that the solvent and counterion had on the crystal packing and spin crossover properties. Full article
(This article belongs to the Special Issue Spin-Crossover Beyond the Immediate Tribute)
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22 pages, 6949 KiB  
Review
Recent Advances of Cellulase Immobilization onto Magnetic Nanoparticles: An Update Review
by Kamyar Khoshnevisan, Elahe Poorakbar, Hadi Baharifar and Mohammad Barkhi
Magnetochemistry 2019, 5(2), 36; https://doi.org/10.3390/magnetochemistry5020036 - 10 Jun 2019
Cited by 68 | Viewed by 8122
Abstract
Cellulosic enzymes, including cellulase, play an important role in biotechnological processes in the fields of food, cosmetics, detergents, pulp, paper, and related industries. Low thermal and storage stability of cellulase, presence of impurities, enzyme leakage, and reusability pose great challenges in all these [...] Read more.
Cellulosic enzymes, including cellulase, play an important role in biotechnological processes in the fields of food, cosmetics, detergents, pulp, paper, and related industries. Low thermal and storage stability of cellulase, presence of impurities, enzyme leakage, and reusability pose great challenges in all these processes. These challenges can be overcome via enzyme immobilization methods. In recent years, cellulase immobilization onto nanomaterials became the focus of research attention owing to the surface features of these materials. However, the application of these nanomaterials is limited due to the efficacy of their recovery process. The application of magnetic nanoparticles (MNPs) was suggested as a solution to this problem since they can be easily removed from the reaction mixture by applying an external magnet. Recently, MNPs were extensively employed for enzyme immobilization owing to their low toxicity and various practical advantages. In the present review, recent advances in cellulase immobilization onto functionalized MNPs is summarized. Finally, we discuss enhanced enzyme reusability, activity, and stability, as well as improved enzyme recovery. Enzyme immobilization techniques offer promising potential for industrial applications. Full article
(This article belongs to the Special Issue Magnetic Nanoparticles)
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12 pages, 1223 KiB  
Article
A Novel Family of Triangular CoII2LnIII and CoII2YIII Clusters by the Employment of Di-2-Pyridyl Ketone
by Constantinos G. Efthymiou, Áine Ní Fhuaráin, Júlia Mayans, Anastasios Tasiopoulos, Spyros P. Perlepes and Constantina Papatriantafyllopoulou
Magnetochemistry 2019, 5(2), 35; https://doi.org/10.3390/magnetochemistry5020035 - 4 Jun 2019
Cited by 7 | Viewed by 3502
Abstract
The synthesis, structural characterization and magnetic study of novel CoII/4f and CoII/YIII clusters are described. In particular, the initial employment of di-2-pyridyl ketone, (py)2CO, in mixed metal Co/4f chemistry, provided access to four triangular clusters, [Co [...] Read more.
The synthesis, structural characterization and magnetic study of novel CoII/4f and CoII/YIII clusters are described. In particular, the initial employment of di-2-pyridyl ketone, (py)2CO, in mixed metal Co/4f chemistry, provided access to four triangular clusters, [CoII2MIII{(py)2C(OEt)(O)}4(NO3)(H2O)]2[M(NO3)5](ClO4)2 (M = Gd, 1; Dy, 2; Tb, 3; Y, 4), where (py)2C(OEt)(O)− is the monoanion of the hemiketal form of (py)2CO. Clusters 1–4 are the first reported Co/4f (1–3) and Co/Y (4) species bearing (py)2CO or its derivatives, despite the fact that over 200 metal clusters bearing this ligand have been reported so far. Variable-temperature, solid-state dc and ac magnetic susceptibility studies were carried out on 1–4 and revealed the presence of weak ferromagnetic exchange interactions between the metal ions (JCo-Co = +1.3 and +0.40 cm−1 in 1 and 4, respectively; JCo-Gd = +0.09 cm−1 in 1). The ac susceptibility studies on 2 revealed nonzero, weak out-of-phase (χ’’M) signals below ~5 K. Full article
(This article belongs to the Special Issue A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday)
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15 pages, 4015 KiB  
Article
Chloranilato-Based Layered Ferrimagnets with Solvent-Dependent Ordering Temperatures
by Cristian Martínez-Hernández, Samia Benmansour and Carlos J. Gómez-García
Magnetochemistry 2019, 5(2), 34; https://doi.org/10.3390/magnetochemistry5020034 - 4 Jun 2019
Cited by 3 | Viewed by 2808
Abstract
We report the synthesis and the characterization of six new heterometallic chloranilato-based ferrimagnets formulated as (NBu4)[MnCr(C6O4Cl2)3]·nG with n = 1 for G = C6H5Cl (1), C6 [...] Read more.
We report the synthesis and the characterization of six new heterometallic chloranilato-based ferrimagnets formulated as (NBu4)[MnCr(C6O4Cl2)3]·nG with n = 1 for G = C6H5Cl (1), C6H5I (3), and C6H5CH3 (4); n = 1.5 for G = C6H5Br (2) and n = 2 for G = C6H5CN (5) and C6H5NO2 (6); (C6O4Cl2)2− = 1,3-dichloro,2,5-dihydroxy-1,4-benzoquinone dianion. The six compounds are isostructural and show hexagonal honeycomb layers of the type [MnCr(C6O4Cl2)3]− alternating with layers containing the NBu4+ cations. The hexagons are formed by alternating Mn(II) and Cr(III) connected by bridging bis-bidentate chloranilato ligands. The benzene derivative solvent molecules are located in the hexagonal channels (formed by the eclipsed packing of the honeycomb layers) showing π-π interactions with the anilato rings. The six compounds behave as ferrimagnets with ordering temperatures in the range 9.8–11.2 K that can be finely tuned by the donor character of the benzene ring and by the number of solvent molecules inserted in the hexagonal channels. The larger the electron density on the aromatic ring and the larger the number of solvent molecules are, the higher Tc is. The only exception is provided by toluene, where the formation of H-bonds might be at the origin of weaker π-π interactions observed in this compound. Full article
(This article belongs to the Special Issue A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday)
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12 pages, 5855 KiB  
Article
How to Quench Ferromagnetic Ordering in a CN-Bridged Ni(II)-Nb(IV) Molecular Magnet? A Combined High-Pressure Single-Crystal X-Ray Diffraction and Magnetic Study
by Gabriela Handzlik, Barbara Sieklucka, Hanna Tomkowiak, Andrzej Katrusiak and Dawid Pinkowicz
Magnetochemistry 2019, 5(2), 33; https://doi.org/10.3390/magnetochemistry5020033 - 1 Jun 2019
Cited by 8 | Viewed by 3615
Abstract
High-pressure (HP) structural and magnetic properties of a magnetic coordination polymer {[NiII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Ni2Nb) are presented, discussed and compared with its two previously reported analogs {[MnII(pyrazole)4 [...] Read more.
High-pressure (HP) structural and magnetic properties of a magnetic coordination polymer {[NiII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Ni2Nb) are presented, discussed and compared with its two previously reported analogs {[MnII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Mn2Nb) and {[FeII(pyrazole)4]2[NbIV(CN)8]·4H2O}n (Fe2Nb). Ni2Nb shows a significant decrease of the long-range ferromagnetic ordering under high pressure when compared to Mn2Nb, where the pressure enhances the Tc (magnetic ordering temperature), or to Fe2Nb exhibiting a pressure-induced spin crossover. The different HP magnetic responses of the three compounds were rationalized and correlated with the structural models as determined by single-crystal X-ray diffraction. Full article
(This article belongs to the Special Issue A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday)
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9 pages, 1876 KiB  
Communication
Estimation of Absolute Spin Counts in Nitronyl Nitroxide-Bearing Graphene Nanoribbons
by Dmitri Stass and Evgeny Tretyakov
Magnetochemistry 2019, 5(2), 32; https://doi.org/10.3390/magnetochemistry5020032 - 29 May 2019
Cited by 8 | Viewed by 3104
Abstract
The degrees of spin labeling of a polyphenylene-based polymer and its graphitized derivative with a stable nitronyl nitroxide were evaluated by estimating the absolute numbers of spins in a set of samples using continuous wave (CW) electron spin resonance (ESR). For these particular [...] Read more.
The degrees of spin labeling of a polyphenylene-based polymer and its graphitized derivative with a stable nitronyl nitroxide were evaluated by estimating the absolute numbers of spins in a set of samples using continuous wave (CW) electron spin resonance (ESR). For these particular systems, the degrees of spin labeling were found to be approximately 0.8% and 1.3%, respectively. The developed procedure complements the more advanced time-resolved/cryogenic ESR studies on these systems by focusing on the stable spin labels introduced in these magnetically intricate materials and providing an estimate of their absolute amount, which is indispensable in the development of synthetic approaches to prepare modified graphene systems and for evaluating the success of these systems. Full article
(This article belongs to the Special Issue Controlling Molecular Nanomagnets)
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0 pages, 588 KiB  
Article
RETRACTED: Conflicts of Interest and Misleading Statements in Official Reports about the Health Consequences of Radiofrequency Radiation and Some New Measurements of Exposure Levels
by Susan Pockett
Magnetochemistry 2019, 5(2), 31; https://doi.org/10.3390/magnetochemistry5020031 - 5 May 2019
Cited by 2 | Viewed by 15898 | Retraction
Abstract
Official reports to governments throughout the Western world attempt to allay public concern about the increasing inescapability of the microwaves (also known as radiofrequency radiation or RF) emitted by “smart” technologies, by repeating the dogma that the only proven biological effect of RF [...] Read more.
Official reports to governments throughout the Western world attempt to allay public concern about the increasing inescapability of the microwaves (also known as radiofrequency radiation or RF) emitted by “smart” technologies, by repeating the dogma that the only proven biological effect of RF is acute tissue heating, and assuring us that the levels of radiation to which the public are exposed are significantly less than those needed to cause acute tissue heating. The present paper first shows the origin of this “thermal-only” dogma in the military paranoia of the 1950s. It then reveals how financial conflict of interest and intentionally misleading statements have been powerful factors in preserving that dogma in the face of now overwhelming evidence that it is false, using one 2018 report to ministers of the New Zealand government as an example. Lastly, some new pilot measurements of ambient RF power densities in Auckland city are reported and compared with levels reported in other cities, various international exposure limits, and levels shown scientifically to cause biological harm. It is concluded that politicians in the Western world should stop accepting soothing reports from individuals with blatant conflicts of interest and start taking the health and safety of their communities seriously. Full article
12 pages, 2489 KiB  
Article
Series of Chloranilate-Bridged Dinuclear Lanthanide Complexes: Kramers Systems Showing Field-Induced Slow Magnetic Relaxation
by Ryuta Ishikawa, Shoichi Michiwaki, Takeshi Noda, Keiichi Katoh, Masahiro Yamashita and Satoshi Kawata
Magnetochemistry 2019, 5(2), 30; https://doi.org/10.3390/magnetochemistry5020030 - 2 May 2019
Cited by 15 | Viewed by 4293
Abstract
A series of chloralilate-bridged dinuclear lanthanide complexes of formula [{LnIII(Tp)2}2(μ-Cl2An)]·2CH2Cl2, where Cl2An2− and Tp− represent the chloranilate and hydrotris (pyrazolyl)borate ligands, respectively, and Ln = Gd ( [...] Read more.
A series of chloralilate-bridged dinuclear lanthanide complexes of formula [{LnIII(Tp)2}2(μ-Cl2An)]·2CH2Cl2, where Cl2An2− and Tp− represent the chloranilate and hydrotris (pyrazolyl)borate ligands, respectively, and Ln = Gd (1), Tb (2), Ho (3), Er (4), and Yb (5) was synthesized. All five complexes were characterized by an elemental analysis, infrared spectroscopy, single crystal X-ray diffraction, and SQUID measurements. The complexes 1–5 in the series were all isostructural. A comparison of the temperature dependence of the dc magnetic susceptibility data of these complexes revealed clear differences depending on the lanthanide center. Ac magnetic susceptibility measurements revealed that none of the five complexes exhibited a slow magnetic relaxation under a zero applied dc field. On the other hand, the Kramers systems (complexes 4 and 5) clearly displayed a slow magnetic relaxation under applied dc fields, suggesting field-induced single-molecule magnets that occur through Orbach and Raman relaxation processes. Full article
(This article belongs to the Special Issue A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday)
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6 pages, 1291 KiB  
Communication
Sensitive Water Ligand Observed via Gradient Spectroscopy with 19F Detection for Analysis of Fluorinated Compounds Bound to Proteins
by Kazuo Furihata and Mitsuru Tashiro
Magnetochemistry 2019, 5(2), 29; https://doi.org/10.3390/magnetochemistry5020029 - 1 May 2019
Cited by 6 | Viewed by 2736
Abstract
The water ligand observed via a gradient spectroscopy type experiment with 19F detection was applied to selectively detect fluorinated compounds with affinity to the target proteins. The 19F signals of bound and unbound compounds were observed as opposite phases, which was [...] Read more.
The water ligand observed via a gradient spectroscopy type experiment with 19F detection was applied to selectively detect fluorinated compounds with affinity to the target proteins. The 19F signals of bound and unbound compounds were observed as opposite phases, which was advantageous to distinguish the binding state. The proposed NMR method was optimized based on the 19F{1H} saturation transfer difference pulse sequence, and various inversion pulses for the water resonance were evaluated with the aim of high sensitivity. Full article
(This article belongs to the Special Issue Nuclear Magnetic Resonance Spectroscopy in Biomedical Application)
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14 pages, 2207 KiB  
Article
Bilayer Thin Films That Combine Luminescent and Spin Crossover Properties for an Efficient and Reversible Fluorescence Switching
by Alin-Ciprian Bas, Xavier Thompson, Lionel Salmon, Christophe Thibault, Gábor Molnár, Oleg Palamarciuc, Lucie Routaboul and Azzedine Bousseksou
Magnetochemistry 2019, 5(2), 28; https://doi.org/10.3390/magnetochemistry5020028 - 1 May 2019
Cited by 9 | Viewed by 4996
Abstract
We report on the vacuum thermal deposition of bilayer thin films of the luminescent complex Ir(ppy)3, tris[2-phenylpyridinato-C2,N]iridium(III), and the spin crossover complex [Fe(HB(tz)3)2], bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(II). Switching the spin state of iron ions from the low spin to the [...] Read more.
We report on the vacuum thermal deposition of bilayer thin films of the luminescent complex Ir(ppy)3, tris[2-phenylpyridinato-C2,N]iridium(III), and the spin crossover complex [Fe(HB(tz)3)2], bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(II). Switching the spin state of iron ions from the low spin to the high spin state around 337 K leads to a reversible jump of the luminescence intensity, while the spectrum shape and the luminescence lifetime remain unchanged. The luminescence modulation occurs due to the different UV light absorption properties of the iron complex in the two spin states and its magnitude can therefore be precisely adjusted by varying the film thickness. These multilayer luminescence switches hold potential for micro- and nanoscale thermal sensing and imaging applications. Full article
(This article belongs to the Special Issue Spin-Crossover Beyond the Immediate Tribute)
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14 pages, 3714 KiB  
Article
Correlation between Slow Magnetic Relaxations and Molecular Structures of Dy(III) Complexes with N5O4 Nona-Coordination
by Kaede Kobayashi, Yukina Harada, Kazuki Ikenaga, Yasutaka Kitagawa, Masayoshi Nakano and Takashi Kajiwara
Magnetochemistry 2019, 5(2), 27; https://doi.org/10.3390/magnetochemistry5020027 - 18 Apr 2019
Cited by 2 | Viewed by 3363
Abstract
A series of Dy(III) mononuclear complexes [DyA2L]+ (L denotes Schiff base N5 ligand that occupies equatorial positions and A− denotes bidentate anionic O-donor ligands such as NO3− (1), AcO− (2), [...] Read more.
A series of Dy(III) mononuclear complexes [DyA2L]+ (L denotes Schiff base N5 ligand that occupies equatorial positions and A− denotes bidentate anionic O-donor ligands such as NO3− (1), AcO− (2), and acac− (3)) were synthesized to investigate the correlation between the slow magnetic relaxation phenomena and the coordination structures around Dy(III). The Dy(III) ion in each complex is in a nona-coordination with the anionic O-donor ligand occupying up- and down-side positions of the N5 equatorial plane. 2 and 3 show slow magnetic relaxation phenomena under a zero bias-field condition, and all complexes showed slow magnetic relaxation under the applied 1000-Oe bias-field conditions. Arrhenius analyses revealed that the ΔE/kB, the barrier height for magnetization flipping, increases in this order, with the values of 24.1(6), 85(3), and 140(15) K. The effects of the exchanging axial ligands on the magnetic anisotropy were discussed together with the DFT calculations. Full article
(This article belongs to the Special Issue A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday)
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8 pages, 2216 KiB  
Article
Pressure Effects with Incorporated Particle Size Dependency in Graphene Oxide Layers through Observing Spin Crossover Temperature
by Hikaru Kitayama, Ryohei Akiyoshi, Masaaki Nakamura and Shinya Hayami
Magnetochemistry 2019, 5(2), 26; https://doi.org/10.3390/magnetochemistry5020026 - 11 Apr 2019
Cited by 5 | Viewed by 3724
Abstract
This research highlights the pressure effects with the particle size dependency incorporated in two-dimensional graphene oxide (GO)/reduced graphene oxide (rGO). GO and rGO composites employing nanorods (NRs) of type [Fe(Htrz)2(trz)](BF4) have been prepared, and their pressure effects in the [...] Read more.
This research highlights the pressure effects with the particle size dependency incorporated in two-dimensional graphene oxide (GO)/reduced graphene oxide (rGO). GO and rGO composites employing nanorods (NRs) of type [Fe(Htrz)2(trz)](BF4) have been prepared, and their pressure effects in the interlayer spaces through observing the changes of the spin crossover (SCO) temperature (T1/2) have been discussed. The composites show the decrease of interlayer spaces from 8.7 Å to 3.5 Å that is associated with GO to rGO transformation. The shorter interlayer spaces were induced by pressure effects, resulting in the increment of T1/2 from 357 K to 364 K. The pressure effects in the interlayers spaces estimated from the T1/2 value correspond to 24 MPa in pristine [Fe(Htrz)2(trz)](BF4) NRs under hydrostatic pressure. The pressure observed in the composites incorporating NRs (30 × 200 nm) is smaller than that observed in the composite incorporating nanoparticles (NPs) (30 nm). These results clearly demonstrated that the incorporated particle size and shape influenced the pressure effects between the GO/rGO layer. Full article
(This article belongs to the Special Issue A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday)
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2 pages, 138 KiB  
Editorial
Laudation: In Celebration of Masahiro Yamashita’s 65th Birthday
by Barbara Sieklucka
Magnetochemistry 2019, 5(2), 25; https://doi.org/10.3390/magnetochemistry5020025 - 10 Apr 2019
Cited by 1 | Viewed by 2691
Abstract
Professor Masahiro Yamashita at the Tohoku University, Japan, celebrates his 65th birthday in 2019 [...] Full article
(This article belongs to the Special Issue A Themed Issue of Functional Molecule-based Magnets: Dedicated to Professor Masahiro Yamashita on the Occasion of his 65th Birthday)
7 pages, 1438 KiB  
Communication
Towards Nanomaterials for Cancer Theranostics: A System of DNA-Modified Magnetic Nanoparticles for Detection and Suppression of RNA Marker in Cancer Cells
by Saira Bakshi, Andrey Zakharchenko, Sergiy Minko, Dmitry M. Kolpashchikov and Evgeny Katz
Magnetochemistry 2019, 5(2), 24; https://doi.org/10.3390/magnetochemistry5020024 - 4 Apr 2019
Cited by 27 | Viewed by 5705
Abstract
Theranostics of cancer using smart biocompatible materials can enable early cancer diagnostics and treatment. Here, we report on a DNA-nanoparticle functional material, which can simultaneously report the presence of an mRNA cancer biomarker and trigger its degradation in cultured cells. The nanodevice consists [...] Read more.
Theranostics of cancer using smart biocompatible materials can enable early cancer diagnostics and treatment. Here, we report on a DNA-nanoparticle functional material, which can simultaneously report the presence of an mRNA cancer biomarker and trigger its degradation in cultured cells. The nanodevice consists of two species of magnetic beads, each of which is conjugated with different components of a multicomponent deoxyribozyme (DZ) sensor. The system is activated only under two conditions: (i) in the presence of a specific target mRNA and (ii) when a magnetic field is applied. We demonstrate that delivery of such a system is markedly enhanced by the application of a magnetic field. The system not only fluorescently detects target mRNA in cultured MCF-7 cancer cells, but also induces its downregulation. Thus, the two-component magnetic nanoparticle system has characteristics of a material that can be used for cancer theranostics. Full article
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2 pages, 410 KiB  
Editorial
Announcing the 2019 Magnetochemistry Travel Award for Post-Doctoral Fellows
by Carlos J. Gómez García
Magnetochemistry 2019, 5(2), 23; https://doi.org/10.3390/magnetochemistry5020023 - 1 Apr 2019
Viewed by 1910
Abstract
The 2019 Magnetochemistry travel award for post-doctoral fellows has been granted to Dr. Giuseppe Ferrauto from the Molecular Imaging Center, University of Torino, Italy. Full article
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13 pages, 2571 KiB  
Article
Solution-State Spin Crossover in a Family of [Fe(L)2(CH3CN)2](BF4)2 Complexes
by Benjamin H. Wilson, Hayley S. Scott, Rosanna J. Archer, Corine Mathonière, Rodolphe Clérac and Paul E. Kruger
Magnetochemistry 2019, 5(2), 22; https://doi.org/10.3390/magnetochemistry5020022 - 1 Apr 2019
Cited by 4 | Viewed by 4600
Abstract
We report herein on five new Fe(II) complexes of general formula [Fe(L)2(NCCH3)2](BF4)2•xCH3CN (L = substituted 2-pyridylimine-based ligands). The influence of proximally located electron withdrawing groups (e.g., NO2, [...] Read more.
We report herein on five new Fe(II) complexes of general formula [Fe(L)2(NCCH3)2](BF4)2•xCH3CN (L = substituted 2-pyridylimine-based ligands). The influence of proximally located electron withdrawing groups (e.g., NO2, CN, CF3, Cl, Br) bound to coordinated pyridylimine ligands has been studied for the effect on spin crossover in their Fe(II) complexes. Variable-temperature UV-visible spectroscopic studies performed on complexes with more strongly electronegative ligand substituents revealed spin crossover (SCO) in the solution, and thermodynamic parameters associated with the spin crossover were estimated. Full article
(This article belongs to the Special Issue Spin-Crossover Beyond the Immediate Tribute)
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15 pages, 12477 KiB  
Article
Evidence of Photo-Thermal Effects on the First-Order Thermo-Induced Spin Transition of [{Fe(NCSe)(py)2}2(m-bpypz)] Spin-Crossover Material
by Kamel Boukheddaden, Houcem Fourati, Yogendra Singh and Guillaume Chastanet
Magnetochemistry 2019, 5(2), 21; https://doi.org/10.3390/magnetochemistry5020021 - 1 Apr 2019
Cited by 17 | Viewed by 3793
Abstract
We have investigated by means of optical microscopy and magnetic measurements the first-order thermal spin transition of the [{Fe(NCSe)(py)2}2(m-bpypz)] spin-crossover compound under various shining intensities, far from the light-induced spin-state trapping region. We found evidence of photo-heating effects on [...] Read more.
We have investigated by means of optical microscopy and magnetic measurements the first-order thermal spin transition of the [{Fe(NCSe)(py)2}2(m-bpypz)] spin-crossover compound under various shining intensities, far from the light-induced spin-state trapping region. We found evidence of photo-heating effects on the thermally-induced hysteretic response of this spin-crossover material, thus causing the shift of the thermal hysteresis to lower temperature regions. The experimental results are discussed in terms of the apparent crystal temperature and are analyzed theoretically using two evolution equations of motion, written on the high-spin (HS) fraction and heat balance between the crystal and the thermal bath. A very good qualitative agreement was found between experiment and theory in the stationary regime, explaining the experimental observations well and identifying the key factors governing these photo-thermal effects. Full article
(This article belongs to the Special Issue Spin-Crossover Beyond the Immediate Tribute)
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