Hydrothermal Synthesis of New Organically Templated Beryllium Phosphite and Phosphate with 3,4-connected Networks.

Two organically templated beryllium phosphite and phosphate, [H2tmpda][Be3(HPO3)4] ( 1) and [H2ampy][Be3(HPO4)4] ( 2) [tmpda = N,N,N′,N′-tetramethyl-1,3-propanediamine, ampy = 3-(aminomethyl)pyridine], were synthesized and structurally characterized. Compound 1 exhibits a (3,4)-connected layered structure with eight-ring windows, and it has a 44 grid topology by regarding the heptameric [Be3(HPO3)4] group as a 4-connected node in the layer. Compound 2 possesses a different (3,4)-connected three-dimensional framework with multidirectional 8-ring channels and zigzag 12-ring channels. This 3D architecture shows a pcu topology when the heptameric [Be3(HPO4)4] groups are regarded as 6-connected secondary building units. Crystal data: 1, monoclinic, P21/ m, a = 8.0217(6) Å, b = 13.7969(5) Å, c = 8.6581(2) Å, β = 92.315(3)°, V = 957.45(8) Å3, Z = 2, R1 = 0.0761, wR2 = 0.1640; 2, monoclinic, P21/ n, a = 7.5292(5) Å, b = 14.0999(8) Å, c = 16.5910(3) Å, β = 95.740(3)°, V = 1752.49(16) Å3, Z = 4, R1 = 0.0434, wR2 = 0.1017. [ABSTRACT FROM AUTHOR]