Symmetry in Coordination Chemistry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Chemistry: Symmetry/Asymmetry".

Deadline for manuscript submissions: closed (31 December 2018) | Viewed by 9654

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Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Tokyo 162-8601, Japan
Interests: inorganic coordination chemistry; physical inorganic chemistry (magnetism and spectroscopic properties); structural chemistry (X-ray crystallography) ; bioinorganic chemistry; nano-materials for environmental applications (biofuel cell or DSSC)
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Special Issue Information

Dear Colleagues,

Metal complexes have usually symmetric coordination geometry around their central metals, such as octahedral, tetrahedral, or square planar, and so on. Historically, its stereochemistryas as well as symmetry (and asymmetry by chirality) helped to establish these compounds and the research field in chemistry by A. Werner. In addition to molecular structures, their crystal structures including supramolecular structures, spectroscopic properties including electronic states, and theoretical treatment, such as ligand field theory, molecular orbitals, and symmetry (in DFT) are important concept of metal complexes. This Special Issue of Symmetry, “Symmetry in Coordination Chemistry”, features articles on such papers of metal complexes or coordination chemistry widely.

Prof. Dr. Takashiro Akitsu
Guest Editor

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Keywords

  • metal complex
  • chirality
  • spectroscopy
  • crsytallography
  • molecular orbital

Published Papers (3 papers)

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Research

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11 pages, 4539 KiB  
Article
Linearly Polarized UV Light-Induced Optical Anisotropy of PVA Films and Flexible Macrocycle Schiff Base Ni(II), Cu(II), Zn(II) Dinuclear Complexes
by Masahiro Takase, Shiomi Yagi, Tomoyuki Haraguchi, Shabana Noor and Takashiro Akitsu
Symmetry 2018, 10(12), 760; https://doi.org/10.3390/sym10120760 - 17 Dec 2018
Cited by 5 | Viewed by 2595
Abstract
Three dinuclear metal complexes (comprised of six-coordinated nNi2L and five-coordinated nCu2L and nZn2L) were confirmed by means of elemental analysis, UV-vis and IR spectra, and single X-ray crystal structural analysis in a spectroscopic study. The stable structures [...] Read more.
Three dinuclear metal complexes (comprised of six-coordinated nNi2L and five-coordinated nCu2L and nZn2L) were confirmed by means of elemental analysis, UV-vis and IR spectra, and single X-ray crystal structural analysis in a spectroscopic study. The stable structures of these nNi2L, nCu2L, and nZn2L complexes in poly(vinylalcohol) (PVA) films were analyzed using UV-vis spectra. The molecular orientation of hybrid PVA film materials after linearly polarized light irradiation was analyzed to obtain the polarized spectra and dichroic ratio. Among the three materials, nNi2L and nZn2L complexes indicated an increasing optical anisotropy that depended on the flexibility of the complexes. We have included a discussion on the formation of the pseudo-crystallographic symmetry of the components in a soft matter (PVA films). Full article
(This article belongs to the Special Issue Symmetry in Coordination Chemistry)
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11 pages, 4109 KiB  
Article
Polarized Light-Induced Molecular Orientation Control of Rigid Schiff Base Ni(II), Cu(II), and Zn(II) Binuclear Complexes as Polymer Composites
by Hiroyuki Nakatori, Tomoyuki Haraguchi and Takashiro Akitsu
Symmetry 2018, 10(5), 147; https://doi.org/10.3390/sym10050147 - 7 May 2018
Cited by 7 | Viewed by 2917
Abstract
We have investigated linearly polarized UV light-induced molecular orientation due to Weigert effect of composite materials of new six binuclear nickel(II), copper(II), and zinc(II) complexes of two rigid Schiff base ring ligands (L1 and L2) composite materials with methyl [...] Read more.
We have investigated linearly polarized UV light-induced molecular orientation due to Weigert effect of composite materials of new six binuclear nickel(II), copper(II), and zinc(II) complexes of two rigid Schiff base ring ligands (L1 and L2) composite materials with methyl orange (MO), an azo-dye, in polyvinylalchol (PVA) cast films. To compare the degree of molecular orientation, two ligands, namely flexible aliphatic cyclohexane (ML1: NiL1, CuL1, ZnL1) and rigid aromatic (ML2: NiL2, CuL2, ZnL2), were synthesized using amine moiety. We have also characterized these complexes by means of elemental analysis, IR, and UV-vis spectra, single crystal or powder X-ray diffraction (XRD) analysis, and so on. Composite materials of ML1 or ML2+MO+PVA were also prepared to separately disperse the solutes in a polymer matrix. For any metal complexes, optical anisotropy (represented as the R parameters) of ML2+MO+PVA was larger than ML1+MO+PVA because of the rigidness of the ligands. Full article
(This article belongs to the Special Issue Symmetry in Coordination Chemistry)
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Review

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9 pages, 1023 KiB  
Review
Organophosphines in Cis-PtP2CCl Derivatives Structural Aspects
by Milan Melnik, Peter Mikus and Clive Edward Holloway
Symmetry 2018, 10(3), 56; https://doi.org/10.3390/sym10030056 - 28 Feb 2018
Viewed by 2721
Abstract
This manuscript summarizes and analyzes X-ray data of monomeric cis-PtP2CCl derivatives. These complexes crystallize in the following crystal systems: tetragonal, P42/n (3), triclinic, Pī (10), orthorhombic, P212121 (prevails)(16), and monoclinic, P21/c (prevails) [...] Read more.
This manuscript summarizes and analyzes X-ray data of monomeric cis-PtP2CCl derivatives. These complexes crystallize in the following crystal systems: tetragonal, P42/n (3), triclinic, Pī (10), orthorhombic, P212121 (prevails)(16), and monoclinic, P21/c (prevails) (36) examples. There are three sub-groups of the respective complexes: Pt(η1-PL)21-CL)(η1-Cl); Pt(η2-P2L)(η1-CL)(η1-Cl) and Pt(η1-PL)(η2-P,CL)(η1-Cl). The chelating P,P-donor ligands form: four-(POP, PCP), five-(PC2P), six-(PC3P, PCNCP), seven-(PC4P) and even ten-(PCNCNCNCP) membered rings. The chelating P.C-donor ligands create three-(PC), four-(PCC) and five-(PC2C) membered rings. The mean Pt-L bond distance elongates in the sequence: 2.10 Å (C, trans to P) < 2.222 Å (P, trans to Cl) < 2.312 Å (P, trans to C) < 2.360 Å (Cl, trans to P). There are examples which exist in two isomeric forms, of the distortion isomer type. Full article
(This article belongs to the Special Issue Symmetry in Coordination Chemistry)
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