Synthesis and Applications of New Spin Crossover Compounds (Volume II)

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 3982

Special Issue Editors


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Guest Editor
Research Center for Materials with Integrated Properties, Toho University, Funabashi, Tokyo 274-8510, Japan
Interests: coordination chemistry; spin crossover; crystal chemistry
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Guest Editor
Tokyo Denki University, Tokyo, Japan
Interests: Coordination chemistry; X-ray structural analysis; Renewable energy

Special Issue Information

Dear Colleagues,

The crystal chemistry of spin crossover (SCO) behavior in inorganic compounds might be potentially associated with smart materials, promising materials for applications as components of memory devices, displays and sensors. 3-d block transition metal coordination compounds with d4–d7 configuration in an octahedral crystal field have the possibility to exhibit SCO phenomena between the low spin (LS) and the high spin (HS) states, being accompanied by color changes. Octahedral Fe(II) SCO systems with 3d6, which can be transited between the diamagnetic (t2g)6 and the paramagnetic (t2g)4(eg)2 configuration, might be widely and deeply investigated as smart materials. Fe(III) SCO compounds are also important and valuable materials. Spin crossover in Mn(II), Mn(III), Cr(II), Co(II), and Co(III) coordination compounds might be associated with unusual magnetic properties.

Inorganic materials, including coordination complexes with bistable systems between the LS and the HS states, usually triggered by external stimuli, such as temperature, light, pressure, and guest molecule inclusion, are a family of potential candidates for smart materials because the change of the crystal cell volume between the HS and LS states is very large. Various SCO iron(II) coordination compounds, especially those with polymeric 1D, 2D, and 3D frameworks, have been intensively investigated because their polymeric linked framework structures enhance cooperative effects which work among the SCO species, resulting in SCO behavior with large hysteresis and transition temperature ranges near RT.

The interdisciplinary regions chemistry related to spin crossover phenomena are also welcome.

We are hoping to offer a portal for some of this exciting new research associated with spin crossover phenomena, in association with multiproperty materials and functional materials in an attractive and valuable Special Issue of the open access journal, Crystals.

Prof. Dr. Takafumi Kitazawa
Prof. Dr. Takashi Kosone
Guest Editors

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Keywords

  • Spin crossover
  • High spin
  • Low spin
  • Switching magnetic materials
  • Sensor
  • Smart materials
  • Supuramolecular coordination polymer
  • Inclusion compounds with magnetism

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Published Papers (1 paper)

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12 pages, 3432 KiB  
Article
Systematic Design of Crystal Structure for Hofmann-Like Spin Crossover Fe(L)2[Ag(CN)2]2 Complexes
by Takashi Kosone, Yoshinori Makido, Syogo Okuda, Ayaka Haigo, Takeshi Kawasaki, Daisuke Akahoshi, Toshiaki Saito and Takafumi Kitazawa
Crystals 2019, 9(7), 370; https://doi.org/10.3390/cryst9070370 - 20 Jul 2019
Cited by 8 | Viewed by 3533
Abstract
The synthesis, crystal structures, and magnetic properties of a new two-dimensional (2D) Hofmann-like series, FeII(L)2[AgI(CN)2]2 (L = 3-cyano-4-methylpyridine (1), allyl isonicotinate (2), phenyl-isonicotinate (3), and benzyl nicotinate ( [...] Read more.
The synthesis, crystal structures, and magnetic properties of a new two-dimensional (2D) Hofmann-like series, FeII(L)2[AgI(CN)2]2 (L = 3-cyano-4-methylpyridine (1), allyl isonicotinate (2), phenyl-isonicotinate (3), and benzyl nicotinate (4)) were studied. These compounds have a 2D sheet structure because of their strongly determinate self-assembly process. An octahedral FeII ion is coordinated with the nitrogen atoms of[AgI(CN)2 linear units at equatorial positions and monodentate pyridine derivatives at the axial position. The layers construct a parallel stacking array. Compounds 13 show pairs of layers constructed by intermetallic Ag···Ag interactions. Compound 4 shows a mono-layer structure. The substituent bulk of the ligands affects the interlayer space. Compounds 14 undergo a 100% spin transition. However, compound 1, incorporating a smaller group, has a relatively lower critical temperature (Tc = 182 K (1), Tc = 221 K (2), Tc = 227 (3) and Tc1 = 236 K, Tc2 = 215 K (4)). We investigated the correlations between our systematic crystal design, substituent size, and the spin crossover profiles. Full article
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