American Chemical Society
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Amine-Templated Unidimensional Phosphate−Diphosphates of Gallium and Vanadium, [NH3CH2CH2NH3][M(H2PO4)(P2O7)] (M = Ga, V)

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posted on 2000-02-18, 00:00 authored by Ann M. Chippindale
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 (Mr = 402.76, monoclinic, space group Cc, a = 8.6139(4), b = 14.929(1), and c = 9.3109(4) Å, and β = 106.541(4)°; V = 1147.8 Å3, Z = 4, R = 4.39%, and Rw = 5.03% for 2049 observed data (I > 3(σ(I))). The structure consists of anionic chains of formula [Ga(H2PO4)(P2O7)]2- containing GaO6 octahedra linked by PO2(OH)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 ∼ 0.65), have also been prepared. The former has an effective magnetic moment of 2.70(1) μB per vanadium cation consistent with the presence of V3+ ions in an octahedral environment.