Synthesis and Structure of an Open-Framework Zincophosphate [C6N4H22][ZnPO4]4

A new zincophosphate [C6N4H22][ZnPO4]4 1 has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction. It crystallized in the triclinic space group P with a=9.784(2) ?, b=10.074(2) ?, c=8.0573(16) ?, ALPHA=121.62 (3)°, BETA=119.20(3)°, GAMMA=98.37(3)°, V=496.96(17) ?3, Z=1. Refinement gave R1=0.0651, wR2=0.1476 for observed data. The zinc and phosphorous atoms are tetrahedrally coordinated by oxygen atoms with a Zn to P ratio of 1. The structure of 1 is constructed by strictly alternating linking of ZnO4 and PO4 with four-membered rings as the secondary building units. The four-membered rings are further connected in three styles: sharing zinc atoms to form a chain structure, connected using vertices to form an undulating chain, and a 4–1 connection. These connections give a complex threedimensional eight-membered ring channel system.