Abstract
The title compound, [Sn(C4H9)2(C6H5COO)2], was synthesized in order to study the inter-action between di-n-butyl-tin(IV) oxide and some carb-oxy-lic acids. Di-n-butyl-tin(IV) dibenzoate, nBu2Sn(obz)2, exhibits the same structural features as other diorganotin(IV) dibenzoates characterized by an unsymmetrical bidentate bonding mode [Δ(Sn-O) ≃ 0.4 Å] of the two benzoate groups to tin. In a first approximation, the coordination sphere at tin resulting from the two stronger bonded O atoms [2.1227 (17) and 2.1405 (16) Å] and the two α-C atoms of the n-butyl groups [2.125 (3) and 2.129 (2) Å] is compressed to a tetra-gonal disphenoid [〈(C-Sn-C) = 148.2 (1)° and 〈(O-Sn-O) = 82.01 (6)°]. This coordination sphere is expanded by the less strongly bonded two O atoms [2.507 (2) and 2.485 (2) Å] to a substanti-ally distorted octa-hedron and by a weak inter-molecular Sn⋯O inter-action [2.943 (2) Å] to a penta-gonal bipyramid with the formation of centrosymmetric dimers. The unbranched butyl groups adopt two different conformations: anti-gauche [torsion angles: 166.0 (2)-63.9 (4)°] and gauche-gauche [65.0 (3)-56.3 (3)°]. Inter-molecular inter-actions between the dimers are restricted to O⋯H-C contacts (2.64 Å) and van der Waals inter-actions.
Highlights
Organotin(IV) complexes have been studied extensively because of the diversity of structures that such compounds can form and their potential biological activities as well as their wide industrial and agricultural applications (Davies & Smith, 1982)
As part of our interest in this type of complex (Cortés et al, 2011), we describe here the synthesis of the di-n-butyltin(IV) title complex with benzoic anions as ligands
Within the n-butyl groups, the C—C bond lengths are in the range 1.480 (4)–1.527 (4) Å [mean value
Summary
Organotin(IV) complexes have been studied extensively because of the diversity of structures that such compounds can form and their potential biological activities as well as their wide industrial and agricultural applications (Davies & Smith, 1982). As part of our interest in this type of complex (Cortés et al, 2011), we describe here the synthesis of the di-n-butyltin(IV) title complex with benzoic anions as ligands. The structures of some di-n-butyltin carboxylates have been reported previously by Kemmer et al (2000) and Win et al. Acta Cryst. The asymmetric unit of the title compound, showing the atom-labeling scheme and displacement ellipsoids for the non-H atoms at the 50%. Centrosymmetric (center of symmetry = black dot) dimers of the title compound resulting from weak intermolecular Sn O interactions (grey dashed lines).
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