The Syntheses And Characterization Of Organotin Carboxylate Compounds

The organotin compounds have been of great interest for many years because of their versatile bonding modes and their industrial and agricultural applications. And some organotin compounds are established for use as fungicides, biocides and pesticides. In this thesis, four new organotin compounds were synthesized which are [Bu6Sn6O6(L1)6] (1) [Bu6Sn6O6(L2)4(L3)2] (2) [Bu8Sn4O2(L2)4] (3) and [Ph3Sn(L2)] (4). The crystal structures were determined by X-ray single crystal diffraction method.The compounds 1-2 were obtained by the reactions of BuSnOOH with 4-((6-chloropyridin-3-yl)methylamino)benzonic acid (HL1), 4-((pyridin-2-yl)methylamino)benzonic acid (HL2) and p-aminobenzoic acid (HL3). Compounds 1 and 2 show similar structures containing a Sn6O6 drum skeleton in which each of the tin atoms shows a six-coordinated distorted octahedral geometry. The compound 1 differs from 2 in the periphery of the well-known drum structures. The periphery of 1 is six L1 anions, while the periphery of 2 is four L2 anions and two L3 anions. Futhermore, organotin compound containing two kinds of carboxylic acid has never been reported.The compound 3 was obtained by the reaction of Bu2SnO with HL2. It shows similar structure containing a Sn4O4 ladder skeleton in which each of the exo and endo tin atoms shows a six-coordinated distorted octahedral geometry. There exist intermolecular hydrogen-bonding interactions in the compounds 2 and 3. Two-dimensional supramolecular layers are formed by hydrogen-bonding interactions. Compound 4 was obtained by the reaction of Ph3SnOH with HL2. It is a monomolecular structure. The central tin atom shows a five-coordinated trigonal bipyramidal geometry. In addition, a dimer is formed throughπ-πstacking interactions which play an important role in the stabilization of the stacked molecular units.