Four inorganic–organic hybrid complexes built from tetravanadate and macrocyclic oxamide.

Four inorganic–organic hybrid compounds, [M2(CuL)4(V4O12)]·2H2O (M = Co (1), Mn (2)), [Mn2(NiL)4(V4O12)]·2H2O (3), and [Zn2(CuL)4(V4O12)]·2CH3OH·2H2O (4) (M′L, H2L = 2,3-dioxo-5,6,14,15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-dien), have been synthesized and characterized by elemental analysis, IR, UV, fluorescence spectra, and X-ray diffraction analysis. Single-crystal X-ray analysis reveal that both [V4O12]4−and M2V4adapt a chair-like configuration in four structures. The cyclovanadate group [V4O12]4−is a tetradentate bridging ligand linking two [M(M′L)2]2+fragments, producing centroantisymmetric heterometallic hexanuclear [M2M′4] complexes. The variable-temperature magnetic susceptibility measurements (2–300 K) of1and2show weak antiferromagnetic interactions. [ABSTRACT FROM AUTHOR]