Synthesis, structure and magnetic characterization of a vanadium(IV) phosphite, [C2N2H10] · [(VO)3(H2O)(HPO3)4] · H2O

A organically templated vanadium(IV) phosphite, [C2N2H10] · [(VO)3(H2O)(HPO3)4] · H2O, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system with the space group P21/c and cell parameters a = 12.3052(7) Å, b = 11.8124(7) Å, c = 12.687(8) Å, β = 98.840(5)°, V = 1822.30(19) Å3 and Z = 4. The three-dimensional network is built up from the corner linkage of new pentameric secondary building units based on two HPO3 pseudo pyramids and three VO6 octahedra sharing vertices. The framework delimits large 10-membered zigzag tunnels along [1 0 0] and smaller eight-membered ones along [0 0 1]. The water molecules and the diprotonated amines are inserted in the channels. IR spectroscopy, ESR spectra and magnetic susceptibility data for this compound are given.