Dimeric complexes of copper (II) arylcarboxylate with 4-cyanopyridine: synthesis, structural characterization and linear absorption properties
Two new dimeric copper (II) complexes containing 2-chlorobenzoato/4-formylbenzoato and 4-cyanopyridine ligands, [Cu2(m2-O2CC6H4-Cl)4(C5H4N-CN)2] (1) and [Cu2(m2-O2CC6H4-CHO)4(C5H4NCN) 4] (2), were synthesized and characterized by elemental analysis, FT-IR and ESR spectroscopy andsingle-crystal X-ray diffraction methods. In the structure of 1, each copperII cation was surrounded by four oxygen atoms from four different carboxylate of four 2-chlorobenzoate molecules and one nitrogen atom of one 4-cyanopyridine ligand. In the crystal structure of 2, each copperII cation was coordinated by four oxygenatoms from one chelating and two bridging 4-formylbenzoate anions and two nitrogen atoms of two4-cyanopyridine ligands. C–H...O and C–H...Cl hydrogen bonds (for 1) and C–H...O hydrogen bonds and weak C–H...p interactions (for 2) further stabilize the crystal structures. The linear optical absorptioncharacterizations of the complexes were performed by using UV-Vis spectrophotometer. The results obtainedfrom the linear absorption spectra of the complexes observed that these complexes can be used for opticalfiltration among nearly 600 and 950 nm wavelengths for concentrations which are higher than 4 g/L.
Volume 133, 2021
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