6533b854fe1ef96bd12ae8c4

RESEARCH PRODUCT

Mono-aryltin(IV) and mono-benzyltin(IV) complexes with pyridine-2-carboxylic acid and 8-hydroxyquinoline. X-ray structure of p-chloro-phenyl-tris(8-quinolinato)tin(IV)·2CHCl3

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Abstract Complexes RSn(O2CPy)3·2H2O and RSn(Ox)3, (PyCOOH=pyridine-2-carboxylic acid, HOx=8-hydroxyquinoline, R=o- and p-Tolyl, o- and p-ClC6H4=o- and p-ClPh, o-ClC6H4CH2=o-ClBenzyl; besides, R=Ph in RSn(Ox)3) have been synthesized and characterized by elemental analysis and determination of molecular weights in CHCl3 solutions. The structure of p-ClPhSn(Ox)3·2CHCl3 has been determined by X-ray diffractometry. The 7-coordinated tin atom of the monomeric compound is in the center of a pentagonal bipyramid formed by (p-ClPh)C and O and N atoms of the chelating Ox− ligands. The latter type of structure would hold for all complexes according to 119Sn Mossbauer (including the determination of the dynamics of 119Sn nuclei) and IR spectroscopy in the solid state; the ligand −O2CPy appears to chelate Sn through one oxygen atom of the COO− group and the N atom, although the occurrence of one chelating and two monodentate PyCO2− ligands (through COO−), and coordination by the H2O molecules to Sn cannot be excluded. In CDCl3 and CHCl3 solutions, the persistence of the pentagonal bipyramidal species is assumed, in line with 1H-, 13C-, 119Sn-NMR and UV–vis spectroscopic studies.