Layered calcium phenylphosphonate: Synthesis and properties

摘要

Calcium phenylphosphonate, Ca(HO_3PPh)_2, was synthesized by the reaction of calcium nitrate and phenylphosphonic acid. A thorough investigation was performed to study the effect of reaction parameters on the synthesis and growth of crystalline product in a high yield. The compound was structurally characterized by single-crystal X-ray diffraction technique. It consists of a layered structure with inorganic framework of CaO_8 polyhedra from which phenyl groups are pointing out. The inorganic framework is also stabilized by the O-H…O hydrogen bonds. Results from thermal analysis by thermogravimetry and thermodiffractometry revealed that calcium phenylphosphonate is stable up to 300 deg C. The compound undergoes consequent thermal decomposition and phase transitions above 300 deg C temperatures until it converts to #delta#-Ca(PO_3)_2 at 620 deg C.