A novel type of coordination mode of chloranilic acid leading to the formation of polymeric coordination ribbon in the series of mixed-ligand copper(II) complexes with 1, 10-phenanthroline (CROSBI ID 203984)
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Molčanov, Krešimir ; Jurić, Marijana ; Kojić-Prodić, Biserka
engleski
A novel type of coordination mode of chloranilic acid leading to the formation of polymeric coordination ribbon in the series of mixed-ligand copper(II) complexes with 1, 10-phenanthroline
A series of four novel mixed-ligand complexes of copper(II) with 3, 6-dichloro-2, 6-dihydroxy-1, 4-benzoquinone (chloranilic acid) and 1, 10-phenanthroline was prepared and characterised by X-ray structure analysis and IR spectroscopy. Three complexes exhibit square-pyramidal coordination whereas one is in the octahedral coordination. The ligand 1, 10-phenathroline acts in a bidentate chelating mode with N, N-metal binding. Chloranilate dianion coordinates CuII atom in a terminal bidentate ortho-quinone-like mode forming mononuclear complex species. However, in one structure a novel type of coordination mode of chloranilate is observed. In addition to the bidentate mode, a monodentate bridging one through a carboxy oxygen of a symmetry related dianion leads to the formation of polymeric coordination ribbon. Crystal packing of penta-coordinated species in addition to hydrogen bonding involves less common stacking interactions of chelate rings with π-systems of the ligands.
copper(II); chloranilic acid; coordination chemistry; crystal structure
Djelomično financirala Zaklada HAZU (za 2013. godinu).
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