Synthesis, structural and magnetic properties of a series of copper(II) complexes containing a monocarboxylated perchlorotriphenylmethyl radical as a coordinating open-shell ligand

Dalton Transactions : an International Journal of Inorganic Chemistry
Daniel MaspochJaume Veciana

Abstract

A series of complexes of copper(II)-containing a perchlorotriphenylmethyl radical functionalized with a carboxylic group as a new ligand is reported. The compounds [Cu(PTMMC)(2)(L)(3)](PTMMC = (tetradecachloro-4-carboxytriphenyl)methyl radical; L =(1) H(2)O, (2) pyrimidine and ethanol or (3) pyridine), [Cu(2)(PTMMC)(2)(MeCOO)(2)(H(2)O)(2)](4) and [Cu(HPTMMC)(2)(L)(3)](HPTMMC =alpha-H-(tetradecachlorotriphenyl)methane-4-carboxylic acid; L = pyridine)(5) were structurally characterized. In complexes 1, 2, 3, and 5, the copper(II) ion is coordinated to two PTMMC (or HPTMMC) units in a slightly distorted square planar surrounding, while 4 shows a paddle-wheel copper(II) dimer structure, where each Cu metal ion has four O atoms of different carboxylate groups, two of them belonging to two PTMMC radicals. The copper(II)-radical exchange couplings are antiferromagnetic for complexes 1, 2 and 3. A linear three-spin model was applied to complexes 1, 2 and 3 to give J/k(B)=-24.9, -15.0 and -20.7 K, respectively. Magnetic properties of 4 show that it is one of the scarce examples of a spin-frustrated system composed of organic radicals and metal ions. In this case, experimental data were fitted to a magnetic model based on a symmetrical b...Continue Reading

Citations

Feb 26, 2008·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·S KalyanaramanK Ganesan
Jun 13, 2015·Inorganic Chemistry·Emmanuel Di PiazzaStéphane Rigaut
Oct 22, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Vega LloverasJosé Vidal-Gancedo
Aug 19, 2011·Chemical Society Reviews·Imma Ratera, Jaume Veciana
May 11, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Vega LloverasJosé Vidal-Gancedo
Jan 17, 2008·Chemical Society Reviews·Gérard Férey

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