Layered calcium phenylphosphonate: Synthesis and properties |
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Institution: | 1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;2. Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, United States;3. Petrochina Pipeline Research and Development Center, Langfang, Hebei 065000, PR China |
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Abstract: | Calcium phenylphosphonate, Ca(HO3PPh)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 CaO8 polyhedra from which phenyl groups are pointing out. The inorganic framework is also stabilized by the OH⋯O hydrogen bonds. Results from thermal analysis by thermogravimetry and thermodiffractometry revealed that calcium phenylphosphonate is stable up to 300°C. The compound undergoes consequent thermal decomposition and phase transitions above 300°C temperatures until it converts to δ-Ca(PO3)2 at 620°C. |
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