Amine-templated unidimensional phosphate-diphosphates of gallium and vanadium, [NH3CH2CH2NH3][M(H2PO4)(P2O7)] (M = Ga, V)

A new one-dimensional gallium phosphate-diphosphate, [C2H10N2][Ga(H2PO4)(P2O7)], has been synthesized under solvothermal conditions at 433 K in the presence of ethylenediamine, and the structure was determined using room-temperature single-crystal X-ray diffraction data (M-r 402.76, monoclinic, space group Cc, a = 8.6139(4), b = 14.929(1), and c = 9.3109(4) Angstrom, and beta = 106.541(4)degrees; V = 1147.8 Angstrom(3), Z = 4, R = 4.39%, and R-W = 5.03% for 2049 observed data (I > 3(sigma(I))). The structure consists of anionic chains of formula [Ga(H2PO4)(P2O7)](2-) containing GaO6 octahedra linked by PO2(ON)(2) and P2O7 units, which are charge-balanced by ethylenediamine dications. The chains are held together by a network of hydrogen bonds involving both interchain and chain-diamine interactions, Polycrystalline samples of the isostructural vanadium and mixed vanadium-gallium analogues, [C2H10N2][V(H2PO4)(P2O7)] and [C2H10N2][VxGa1-x(H2PO4)(P2O7)] (x similar to 0.65), have also been prepared, The former has an effective magnetic moment of 2.70(1) mu(B) per vanadium cation consistent with the presence of V3+ ions in an octahedral environment.