Hydrothermal Synthesis and Crystal Structure of New Mixed-Valence Ethylenediamine-Vanadium Phosphate [C2H8N2]{(V~vO)(V~(IV)OH)[PO(OH)3](PO4)2}

摘要

New mixed-valence ethylenediamine-vanadium phosphate, [C2H8N2]{(V~VO)(V~(IV)OH)[PO(OH)3](PO4)2} with the 3D open framework structure, has been hydrothermally synthesized and characterized by elemental analysis, XRD, SEM, FTIR, UV-Vis DRS, and single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system with the space group C2/c and cell parameters: a = 22.142(4), b = 8.8901(17), c= 16.195(3) A, β = 126.710(2)°, and V= 2555.6(9) A~3. The structure exhibits a three-dimensional open framework topology with eight-membered ring channels, which are occupied by unprotonated ethylenediamine molecules through N-H … O hydrogen-bond interactions.