STRUCTURE OF PB-SI COMPLEX ALKOXIDE-PREPARED FROM LEAD ACETATE AND TETRAETHOXYSILANE

The products of the reaction between lead acetate and tetraethoxysilan e in 2-methoxyethanol at 100 degrees C were estimated by kinematic vis cosity measurement and infrared and H-1 nuclear magnetic resonance spe ctroscopic techniques. Two reaction methods were used; in method I lea d acetate and tetraethoxysilane were mixed in 2-methoxyethanol, wherea s in method II each reactant was pretreated in 2-methoxyethanol and th en mixed. The reaction product in method I was estimated as (CH3COO)-P b-O-Si-(OC2H4OCH3)(3), which polymerized on prolonged heating. In meth od II lead acetate and tetraethoxysilane were changed to (CH3COO)-Pb-( OC2H4OCH3) and Si(OC2H4OCH3)(4) respectively before mixing. The reacti on product in method II was estimated as (CH3OC2H4O)-Pb-O-Si-(OC2H4OCH 3)(3). No polymerization reaction occurred because of the absence of a cetyl group in the reaction product.