Crystal and molecular structures of two polymeric organotin carboxylates, C₅H₁₂O₂Sn and C₅H₉F₃O₂Sn

Abstract

The crystal and molecular structures of trimethyltin(IV) acetate and trimethyltin(IV) trifluoroacetate have been determined from three-dimensional X-ray data collected by counter methods using MoKα radiation. Both compounds crystallize in the orthorhombic space groupPnma withZ = 4. The acetate hasa = 10·516,b = 8·013,c = 9·706 Å and the trifluoroacetate hasa = 10·567,b = 9·237,c = 9·985 Å. ConventionalR-factors for the two compounds following least squares refinement are, for the acetate, 0·018 (for 731 reflexions) and, for the trifluoroacetate, 0·055 (for 460 reflexions) respectively. The compounds are isostructural and are polymeric with tin atoms linked by carboxylate bridges which are exactly planar. The tin atoms are in five-fold trigonal bipyramidal coordination with the methyl groups in the basal plane and oxygen atoms at the apices. Sn-O interatomic distances are, for the acetate, 2·205(3) and 2·391(4) Å, and for the trifluoroacetate, 2·18(1) and 2·46(2) Å.