Synthesis, crystal structure, EPR of (NH2CH2CH2NH3)4[WVO2(OC6H4O)2]2(NH3CH2CH2NH3)•H2O and comparison with its isomorphic complexes

Cis-dioxo-catecholatolungsten(V) complex (NH2CH2CH2NH3)(4)[(WO2)-O-V(OC6H4O)(2)](2)(NH3CH2CH2NH3)(H2O)-H-. (1) was synthesized at room temperature by the reaction of tetrabutyl ammonium decatungstate with catechol in the mixed solvent of CH3OH, CH3CN and NH2CH2CH2NH2. The crystal structure of complex was determined by X-ray diffraction structural analysis. The results show that complex belongs to monoclinic system with space group P2(1)/c, a=0.7128(3) nm, b=3.0823(11) nm, c=0.9828(4) nm, beta=102.639(6)degrees, V=2.1068(14) nm(3), Z=2, R-1=0.0628, wR(2)= 0.1837. Compared the complex with its analogous complexes (NH2CH2CH2NH3)(3)[(MoO2)-O-V(OC6H4O)(2)], it is found that the coordination structure of W have no changes in the processing of electron transfer of tungsten-containing enzymes from the result of the similarity of the EPR spectra of the complexes and flavoenzyme from milk.