(1) Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;(2) PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
Abstract:
Organically-modified silicate-phosphate and silicate-phosphite copolymers were prepared through nonaqueous acid–base reaction.
The inductive effect of the organic substituent of the starting materials such as organically-modified chlorosilane and phosphorous
acid on the acid–base reaction was investigated by 31P NMR measurement and ab initio molecular orbital calculation. The condensation reaction takes place by nucleophilic addition
of phosphate ion (or phosphite ion) to chlorosilane through SN2 mechanism to form silicate-phosphate (or phosphite) network. The reactivity of the acid–base pair can be controlled by changing
the inductive effect of the organic substituents on the starting materials.