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Two ionic triphenyltin complexes were obtained when two thiocarboxylic acids, mercaptoacetic acid and 3-mercaptopropionic acid, were mixed with triphenyltin hydroxide in the presence of dicylcohexylamine. Their structures have been characterized by IR and multi-nuclear (1H, 13C{1H} and 119Sn{1H}) NMR spectroscopies. Coordination difference was observed between triphenyltin complexes of mercaptoacetate and 3-mercaptopropionate. The coordination assignments of the tin atoms in the two triphenyltin complexes are confirmed by X-ray crystallographic studies. In the solid state, the bidentate binding mode of mercaptoacetate ligand gives a five-coordinate ionic triphenyltin complex with a cis-trigonal-bipyramid (TBP) geometry around tin, while the tin in dicyclohexylammonium 3-mercaptopropionatotriphenylstannate was found to be four-coordinate with tetrahedral geometry around tin, as the 3-mercaptopropionate is monodentate via sulfur. Important hydrogen bonding between dicyclohexylammonium and carboxylate have been observed for both complexes. [ABSTRACT FROM AUTHOR]

Two structurally different triphenyltin complexes of thiosalicylic acid were obtained depending on the amine used. Bis(triphenyltin) thiosalicylate was obtained when diethylamine was used while dicyclohexylammonium thiosalicylatotriphenylstannate resulted with dicyclohexylamine. Their structures have been characterized by IR and multi-nuclear (1H, 13C, 119Sn) NMR spectroscopies. In the solid state, both tins in the bis(triphenyltin) thiosalicylate complex are four-coordinate while the tin in dicyclohexylammonium thiosalicylatetriphenylstannate is five-coordinate. However, in solution, dissociation occurs in the dicyclohexylammonium thiosalicylatotriphenylstannate complex reducing the coordination of tin to four. The coordination of the tin atoms in the two triphenyltin complexes is confirmed by X-ray crystallographic studies. [ABSTRACT FROM AUTHOR]

The tri-n-butyltin(IV) complexes of 2-[(E)-2-(3-formyl-4-hydroxyphenyl)-1-diazenyl]benzoic acid and 4-[((E)-1-{2-hydroxy-5-[(E)-2-(2-carboxyphenyl)-1-diazenyl]phenyl}methylidene)amino]aryls (aryls = 4-CH3, 4-Br, 4-Cl, 4-OCH3) have been synthesized and characterized by 1H, 13C, 119Sn NMR, IR and 119mSn Mössbauer spectroscopic techniques in combination with elemental analysis. The crystal structures of two compounds, (Bu3Sn[O2CC6H4{N=N(C6H3-4-OH-5-CHO)}-o])n and (Bu3Sn[O2CC6H4{N=N(C6H3-4-OH(C(H)=NC6H4Cl-4))}-o])n, are reported.The crystallographic and 119Sn Mössbauer data both indicate that the tributyltin complexes form single-stranded polymeric structures in which the carboxylate O atoms of each aryl ligand bridge two Sn atoms. The Sn atoms have a slighly distorted trigonal bipyramidal coordination geometry with equatorial butyl groups and carboxylate O atoms occupying axial positions. The 119Sn NMR spectroscopic data and the 1J(13C–119/117Sn) coupling constant indicate a tetrahedral coordination geometry in non-coordinating solvents. The results of a toxicity study of a tributyltin compound on the second larval instar of Aedes aegypti mosquito larvae are reported. [Copyright &y& Elsevier]

Abstract: A series of cis-bis{5-[(E)-2-(aryl)-1-diazenyl]quinolinolato}di-n-butyltin(IV) complexes has been synthesized and characterized by 1H-, 13C-, 119Sn NMR, ESI–MS (electrospray ionization mass spectrometry), IR and 119mSn Mössbauer spectroscopic techniques in combination with elemental analyses. The structures of four di-n-butyltin(IV) complexes, viz., n Bu2Sn(L3)2 (3), n Bu2Sn(L4)2 (4), n Bu2Sn(L5)2 (5) and n Bu2Sn(L7)2 ·0.5C6H6 (7) (LH=5-[(E)-2-(aryl)-1-diazenyl)quinolin-8-ol) were determined by single crystal X-ray diffraction. In general, the complexes were found to adopt a distorted cis-octahedral arrangement around the tin atom. These complexes retain their solid-state structure in non-coordinating solvent as evidenced by 119Sn and 13C NMR spectroscopic results. The in vitro cytotoxicity of di-n-butyltin(IV) complexes (3–8) is reported against seven well characterized human tumour cell lines. The basicity of the two quinolinolato donor N and O atoms of the ligands are discussed in relation to the cytotoxicity data. [Copyright &y& Elsevier]

The tribenzyltin(IV) complexes of 2-[(E)-2-(3-formyl-4-hydroxyphenyl)-1-diazenyl]benzoic acid and 2-{(E)-4-hydroxy-3-[(E)-4-(aryl)iminomethyl]phenyldiazenyl}benzoic acids (aryls = 4-CH3, 4-Br, 4-Cl, 4-OCH3) have been synthesized and characterized by 1H, 13C, 119Sn NMR, IR and 119mSn Mössbauer spectroscopic techniques in combination with elemental analysis. The crystal structures of two monomeric tribenzyltin(IV) complexes, Bz3Sn[O2CC6H4{N=N(C6H3-4-OH(C(H)=NC6H4X-4))}-o](OH2) (X = –Cl and –OCH3) are reported. The coordination environment in each complex is trigonal bipyramidal trans-Bz3SnO2. [Copyright &y& Elsevier]