The effect of mixed amines on the competitive formation of two open-framework zinc phosphates with 16-ring large channels

Two new zinc phosphates, Zn6P8O26(OH)6[H3dien]2 (I) and Zn6P8O29(OH)3[H3dien]3 (II) (dien = diethylenetriamine), were solvothermally synthesized in the presence of a mixture of organic amines. Both two structures are built by the alternate linkages between ZnO4 and (H)PO4 tetrahedral moieties producing two intimately related (3,4)-connected framework structures with the 16-ring large channels. The successful synthesis of the two compounds illustrates that a specific “secondary” organic additive governs the resulting open-framework structures besides a “primary” organic amine plays a structure-directing role. Crystal data: triclinic, P1¯, a = 8.5619(1), b = 13.5037(2), c = 16.9251(1) Å, α = 69.545(1)°, β = 89.573(1)°, γ = 86.684(1)°, V = 1830.21(4) Å3, Z = 2 for I, and monoclinic, P21/c, a = 31.9204(3), b = 8.3759(2), c = 15.7894(3) Å, β = 97.062(1)°, V = 4189.46(13) Å3, Z = 4 for II.