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Crystals
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Current Advances in Metal Complexes
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Current Advances in Metal Complexes

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 6334

Special Issue Editor

Prof. María Luz Durán

E-Mail Website
Guest Editor
Dept. Química Inorgánica, Universidad de Santiago de Compostela, Santiago de Compostela, 15782 Santiago, Spain
Interests: schiff bases; selenolates; electrochemical synthesis; X-ray diffraction studies; biological activity

Special Issue Information

Dear Colleagues,

Metal complexes have been studied since the end of the nineteenth century and the early twentieth (1893–1913), starting from the pioneering work of A. Werner, who laid the foundation of coordination chemistry. 

The main thesis of his argument was that metals possess two types of valency, one of which is referred to as the “oxidation state", and the other of which has fixed directions with respect to the central metal and can be satisfied by either negative ions or neutral molecules, now referred to as the “coordination index”. This is the basis for the various stereochemistries found amongst coordination compounds. 

Subsequent work was published by N.V. Sidgwick (1927), L. Pauling (1933), H. Bethe, J.H. van Bleck (1936) and others. Such work expanded the field, which led to a greater understanding of the structures, bonding, stereochemistry and reactivity of metal complexes and the nature of the metal–ligand bond. 

IUPAC defines a coordination compound as any compound composed of a central atom, usually that of a metal, to which is attached a surrounding array of other atoms or groups of atoms, each of those called a ligand. 

Coordination chemistry is currently considered to be at the junction of different branches of chemistry, breaking the boundaries between organic, inorganic and physical chemistry. It is one of the most dynamic fields in recent interdisciplinary science, which lies at the interface between biology, physics and medicine. 

Special Issues are published from time to time on topics of current interest and importance and may also focus on contributions from a specific field. From A. Werner’s studies to the present day, the interest in coordination chemistry remains, and the field is truly wide. 

This Special Issue is dedicated to providing a modern and comprehensive understanding of the most important topics of the current advances in metal complexes.

Prof. María Luz Durán
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2100 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Spectroscopic and magnetic properties of metal complexes
  • Metal complexes and biological activity
  • Synthesis of novel coordination compounds
  • Solid state structures and intermolecular interactions
  • The nature of the metal-ligand bond

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Published Papers (2 papers)

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Research

27 pages, 8630 KiB  
Article
Synthesis, Single Crystal Structural Investigation, Hirshfeld Surface Analysis, Thermoanalysis and Spectroscopic Study of Two New Cu(II) and Co(II) Transition-Metal Complexes
by Rim Boubakri, Mirosław Szybowicz, Mariola Sadej, Sarra Soudani, Frédéric Lefebvre, Valeria Ferretti, Cherif Ben Nasr and Kamel Kaabi
Crystals 2021, 11(8), 986; https://doi.org/10.3390/cryst11080986 - 19 Aug 2021
Cited by 6 | Viewed by 2763
Abstract
Two new complexes, [Cu(dimpyr)2(H2O)2](NO3)2.2H2O (1) and (Hamdimpy)2[CoCl4].H2O (2), with the monodentate ligand 2-amino-6-methylpyrimidin-4-(1H)-one (dimpyr) and the countercation 4-amino-2,6-dimetylpyrimidium (Hamdimpy), [...] Read more.
Two new complexes, [Cu(dimpyr)2(H2O)2](NO3)2.2H2O (1) and (Hamdimpy)2[CoCl4].H2O (2), with the monodentate ligand 2-amino-6-methylpyrimidin-4-(1H)-one (dimpyr) and the countercation 4-amino-2,6-dimetylpyrimidium (Hamdimpy), respectively, were prepared and characterized by single crystal X-ray diffraction, elemental analysis and IR spectroscopy. In (1), the Cu(II) cation is tetracoordinated, in a square plan fashion, by two nitrogen atoms from the pyrimidine ring of the organic ligand and two oxygen atoms of two coordinated water molecules. In the atomic arrangement, the CuO2N2 square planes are interconnected via the formation of O-H…O hydrogen bonds involving both coordinated and free water molecules and NO3− nitrate anions to form inorganic layers parallel to the (a, b) plane at z = (2n + 1)/4. In (2), the central atom Co(II) is four-coordinated in a distorted tetrahedral fashion by four Cl− ions. The [CoCl4]2− tetrahedra are arranged parallel to the plane (1¯10) at x = (2n + 1)/2 and the organic cations are grafted between them by establishing with them hydrogen bonds of CH…Cl and NH…Cl types. The vibrational absorption bands were identified by infrared and Raman spectroscopy. Intermolecular interactions were investigated via Hirshfeld surfaces and electronic properties such as HOMO and LUMO energies were derived. The two compounds were characterized by thermal analysis to determine their thermal behavior with respect to temperature. Full article
(This article belongs to the Special Issue Current Advances in Metal Complexes)
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10 pages, 4731 KiB  
Article
Ultraviolet Light Effects on Cobalt–Thiourea Complexes Crystallization
by Luis Eduardo Trujillo Villanueva, Felipe Legorreta García, Fidel Pérez Moreno, Marius Ramírez Cardona and Edgar Arturo Chávez Urbiola
Crystals 2021, 11(5), 473; https://doi.org/10.3390/cryst11050473 - 23 Apr 2021
Cited by 3 | Viewed by 2801
Abstract
In this work, a cobalt–thiourea complexes crystal synthesis was carried out comparatively with and without ultraviolet light assistance (λ = 253 nm), and its effect was studied. Through the solvent evaporation technique, crystalline forms were obtained, which were analyzed and characterized by different [...] Read more.
In this work, a cobalt–thiourea complexes crystal synthesis was carried out comparatively with and without ultraviolet light assistance (λ = 253 nm), and its effect was studied. Through the solvent evaporation technique, crystalline forms were obtained, which were analyzed and characterized by different techniques: Raman spectroscopy, X-ray diffraction (XRD), and digital optical microscopy. Crystal’s shape changes were observed when comparing those obtained from the solution with and without ultraviolet (UV) assistance. It was found that the UV light effect on the crystals causes a structural modification of the complex synthesized in the (022) (120) planes and without UV assistance in the (002), (111), (131¯), and (132¯) planes. It is also possible to observe an increase in intensity by Raman spectra identified as Co–S bonds (297 cm−1) for crystals synthesized with UV assistance. Full article
(This article belongs to the Special Issue Current Advances in Metal Complexes)
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