ORGANOSILICON DERIVATIVES OF OXYGEN AND NITROGEN DONOR LIGANDS

Abstract

Reactions of chlorotrimethylsilane with long chain fatty acids in 1:1 molar ratio led to the formation of a new series of trimethylsilicon(IV) carboxylates of general formula Me3Si(OCOR), [where R is different for different acids, viz. palmitic acid, R= CH3(CH2)14- ; stearic acid, R= CH3(CH2)16-; lauric acid, R= CH3(CH2)10-; myristric acid, R= CH3(CH2)12-]. Two Schiff bases, SB and HSal-2-ambz have been synthesized from the condensation of salicyaldehyde with aniline and salicyaldehyde with 2-aminomethylbenzimidazole, respectively. The reaction of the sodium salt of HSal-2-ambz with chlorotrimethylsilane in a 1:1 stoichiometry and with dichlorodimethylsilane in 2:1 stoichiometry yielded Me3Si(sal-2- arnbz) and Me2Si(sal-2-ambz)2, respectively. Dimethyldichlorosilane on reaction with Schiff base (SB) and long chain fatty acid in 1:1:1 ratio gives a new series of mixed complexes of general formula, Me2Si(SB)—(OCOR) [where R is different for different acids, viz. palmitic acid, R=CH3(CH2)14- stearic acid, R= CH3(CH2)16-; lauric acid, R= CH3(CH2)io-; mystric acid, R= CH3(CH2)12-1. All of the synthesized ligands and organosilicon complexes have been characterized by elemental analysis, IR and UV-visible spectral studies. ill and "C NMR spectral studies of some complexes show appropriate chemical shift corresponds to the proposed geometry of organosilicon complexes. The residues obtained by the pyrolysis of some of the synthesized complexes have been characterized by XRD and found to be SiO/SiO2. The surface morphology of the residues has been investigated by SEM and particle sizes determined by SEM and XRD are in the range 68-180 nm.