Organotin Compounds, Synthesis And Characterization

Organotin compounds have been used extensively as catalysts, stabilizers for PVC, biocides and anti-tumor agents. Based on the works of former researchers, this thesis provides the synthesis and characterization of several series of organotin compounds and organotin complexes.1.Eleven new complexes of β-alkoxycarbonylethyltin trichlorides and triphenyltin choloride with benzylphenylsulfoxide (BzSOPh),Cl3SnCH2-CHRCO1R1.L and Ph3SnCl (where R=H,CH3;R1=CH3,C2H5,C3H7 C3H5, C4H9;L=BzSOPh), were synthesized and characterized by means of elemental analysis, IR and 1HNMR spectra. The spectroscopic and structural features of these compounds were described and discussed. The complexes of β-alkoxycarbonylethyltin trichlorides with BzSOPh were six-coordinated organotin compounds containing the intramolecular carbonyl and the intermolecular sulfoxide coordination to tin. The crystal structure of triphenyltin chloride complex with BzSOPh was determined and the feature of the tin atom adopted the distorted trigonal bipyramid.2.Five complexes of R2SnCl2(R = Bu, Cy, Ph2, Bz, CH2CH2C- O2CH3) with 4,5-diazafluoren-9-one (DAO) were synthesized and characterized by means of elemental analysis, IR and 1H NMR. The spectroscopic data indicate that DAO as a chelating ligand coordinated to tin by its two nitrogen atoms and the complexes possessed the octahedron structure The crystal strucute of DAO also was determined.3.A series of organotin carboxylates, R'3SnO2CCH2CH2CO- C6H4R-4, R'3SnO2CCHCHCOC6H4R-4 and {4-CH3C6H4COCH2CH2CO2Sn(Bu)2 }2O (where R=H, CH3, Cl; R'=Ph, Cy), were synthesized by azeotropic dehydration from a mixture of R3SnOH or Bu2SnO with 4-RC6H4COCH2-CH2COOH and 4-RC6H4COCHCHCOOH Their structures were characterized by elemental analysis, 1R, 'HNMR spectra and X-ray single crystal diffraction. The spectroscopic and structural features of the compounds were described. Single crystal diffraction of {4-CH3C6H4-COCH2CH2COOSn(Bu)2}2O revealed that the compound have tetra-nuclear centrosymmetric dimeric structure and the distorted trigonal bipyramid at exocyclic and endocyclic tin atoms.4. p-Methoxycarbonylethylphenyltin dibromide was synthesized by the reaction of p-Methoxycarbonylethyl triphenyltin with bromine in trichloromethane. Its complexes were obtained by the reaction with pyridine oxide, triphenyl- phosphine oxide, benzylphenylsulfoxide and the Schiff base derived from salicylaldehyde and a-amino acid. Their structures were characterized by means of elemental analysis, IR, 1HNMR spectra. The spectroscopic data indicated that p-Methoxycarbon-ylethylphenyltin dibromide with pyridine oxide, triphenylphosphine oxide, benzylphenylsulfoxide were six-coordinated organotin compounds containing the intramolecular carbonyl and the external ligand coordination to tin. The crystal structures of Ph3SnCH2CH2COOCH3(1) and Br2PhSnCH2CH2COOCH3(2) show that the tin atom adopts different coordination model. The tin atom in 2 adopts a distorted trigonal bipyramid geometry via intramolecular carbonyl oxygen to tin coordination, while in 1, there is no intramolecular carbonyl oxygen to tin coordination, and the tin atom adopts a tetrahedral geometry.