Hydrothermal synthesis and structure of an open-framework, large-channel vanadium–cobalt phosphate [C4H12N2]2[CoII(H2O)2(VVO2)2(VIVO)2(PO4)4]·2H2O

A novel three-dimensional vanadium–cobalt phosphate, [C4H12N2]2[CoII(H2O)2(VVO2)2(VIVO)2(PO4)4]·2H2 (1), was synthesized hydrothermally and characterized by single crystal X-ray diffraction, thermal gravimetric analysis and fluorescence spectroscopy. This complex crystallizes in the triclinic system with the space group image, and cell parameters a = 7.06610(10) Å, b = 9.6778(10) Å, c = 11.6217(2) Å, α = 106.3260(10)°, β = 97.8430(10)°, γ = 107.7070(10)°, Z = 1. The three-dimensional vanadium–cobalt phosphate is constructed from VIVO6 octahedral chains and VV–CoII–VV clusters which are linked via PO4 tetrahedra, which make complex 1 contain channels in multi-directions in which diprotonated piperazine ions and water molecules reside.