Structure of Complex Alkoxides Prepared from Lead Acetate and Tetraethoxysilane

Abstract

The products of reaction between lead acetate and tetraethoxysilane (TEOS) in 2-methoxyethanol (CH₃OC₂H₄OH) at 100°C were identified by kinematic viscosity measurement and IR and 1H-NMR spectroscopic techniques. Two reaction methods were used: Lead acetate and TEOS were directly reacted in Method I, whereas they were reacted with 2-methoxyethanol prior to the reaction in Method II. The reaction product in Method I is identified as (CH₃COO)-Pb-O-Si-(OC₂H₄OCH₃)₃, which polymerized during prolonged heating. In Method II, lead acetate and TEOS changed to (CH₃COO)-Pb-(OC₂H₄OCH₃) and Si(OC₂H₄OCH₃)₄, respectively, by the reaction with 2-methoxyethanol. The reaction product in Method II was identified as (CH₃OC₂H₄O)-Pb-O-Si-(OC₂H₄OCH₃)₃. No polymerization reaction occurred, because there was no acetyl group in the reaction product.