Organic−Inorganic Hybrid Material of Phenyl-Modified Polysilicophosphate Prepared through Nonaqueous Acid−Base Reaction

Abstract

An organic−inorganic hybrid material of phenylsilicophosphate was prepared through the solventless and catalyst-free nonaqueous acid−base reaction of orthophosphoric acid and phenyl-modified chlorosilane. The 31P NMR results showed that the silicophosphate is constituted of an alternating (POOPh2SiO)n− network, which is expected to be very homogeneous at an atomic level. It was found that the condensation took place through the nucleophilic addition of the phosphate ion to the organochlorosilane, that is, an SN2 reaction mechanism. The electron-withdrawing property of the phenyl group attached to the central silicon, hence, forwarded the formation of the silicophosphate network.