A new organically-templated cobalt borophosphate with a novel borophosphatic anionic partial structure

A novel cobalt borophosphate, (NH4)2(C4H12N2)[Co2B4P6O24(OH)2]·H2O with the mixed cations has been synthesized under mild hydrothermal conditions. Its crystal structure was determined by the single-crystal X-ray diffraction (tetragonal, I41/a (no. 88), a=14.207(3) Å, c=24.956(6) Å, V=5037.09(2) Å3, Z=8). The crystal structure consists of a new type of three-dimensional borophosphatic anionic partial framework, which is built from the condensation of the fundamental building unit (FBU) [B2P3O14(OH)]. The CoO6 octahedra are enchased in such borophosphate network to form a complex open framework with a three-dimensional intersecting channel system, the voids of which are occupied by ammonium, dipronated piperazine ions and water molecules, respectively. The magnetic measurement of the title compound has also been investigated.