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

A new one-dimensional gallium phosphate−diphosphate, [C 2 H 10 N 2 ][Ga(H 2 PO 4 )(P 2 O 7 )], 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) Å, and β = 106.541(4)°; V = 1147.8 Å 3, Z = 4, R = 4.39%, and R w = 5.03% for 2049 observed data ( I > 3( σ (I))). The structure consists of anionic chains of formula [Ga(H 2 PO 4 )(P 2 O 7 )] 2 - containing GaO 6 octahedra linked by PO 2 (OH) 2 and P 2 O 7 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, [C 2 H 10 N 2 ][V(H 2 PO 4 )(P 2 O 7 )] and [C 2 H 10 N 2 ][[V x Ga 1 - x (H 2 PO 4 )(P 2 O 7 )] ( x ∼ 0.65), have also been prepared. The former has an effective magnetic moment of 2.70(1) μ B per vanadium cation consistent with the presence of V 3+ ions in an octahedral environment.