(NC5H12)2·Zn3(HPO3)4: A Low-Density Framework Built Up from a Fully Connected (3,4) Net of ZnO4 Tetrahedra and HPO3 Pseudo Pyramids

(NC5H12)2·Zn3(HPO3)4, the first organically templated, three-dimensional zincophosphite framework, is built up from a fully connected (3,4) net of ZnO4 tetrahedra and HPO3 pseudo pyramids, sharing vertices as Zn-O-P bonds. These units self-assemble around the piperidinium templates to result in a low-density anionic framework containing helical columns and 4-ring and 16-ring windows. Crystal data: (NC5H12)2·Zn3(HPO3)4, Mr= 688.39, monoclinic, C2/c (No. 15), a=16.3351(7) ?, b=9.2750(4) ?, c=17.2416(8) ?, beta=117.987(1)°, V=2306.8 (3) ?3, Z=4, R=0.032, RW=0.036.