Synthesis and physicochemical properties of the d metal complexes with 2-phenyl-4-(piperidyl-1)-pyrido[2,3-a]anthraquinone. the molecular and crystal structures of 2-phenyl-4-(piperidyl-1)-pyrido[2,3-a]anthraquinonium-7,12 tetranitrozincate

Two types of complexes of 2-phenyl-4-(piperidyl-1)-pyrido[2,3-a] anthraquinone (L) with transition metals were isolated from neutral acetonitrile and acidified acetonitrile and ethanol solutions and characterized. Metal complexes synthesized at pH = 7 had the composition MCl2L • (CH3CN) n (M = Cu, Co, Ni). The complexes (HL) 2[Cu2Cl6] (I), (HL)2[CoCl 4] (II), (HL)2[Zn(NO3)4] (III) were obtained at pH = 1-2. The molecular and crystal structure of complex III was determined. Some spectral parameters of L and its complexes were measured. © 2007 Pleiades Publishing, Ltd.