Crystal structure of catena-poly[[aquadi-n-propyltin(IV)]-μ-oxalato]

Abstract

The title compound, [Sn(C3H7)2(H 2O)(C2O4)] n , represents the first diorganotin(IV) oxalate hydrate to be structurally characterized. The tin(IV) atom of the one-dimensional coordination polymer is located on a twofold rotation axis and is coordinated by two chelating oxalate ligands with two slightly different Sn - O bond lengths of 2.290(2) and 2.365(2)Å, two symmetry-related n-propyl groups with a Sn - C bond lengths of 2.127(3)Å, and a water molecule with a Sn - O bond length of 2.262(2)Å. The coordination polyhedron around the SnIV atom is a slightly distorted pentagonal bipyramid with a nearly linear axis between the trans-oriented n-propyl groups [C - Sn - C = 176.8(1)°]. The bond angles between the oxygen atoms of the equatorial plane range from 70.48(6)° to 76.12(8)°. A one-dimensional coordination polymer results from the less asymmetric bilateral coordination of the centrosymmetric oxalate anion, internally reflected by two slightly different C - O bond lengths of 1.248(3) and 1.254(3)Å. The chains of the polymer propagate parallel to [001] and are held together by hydrogen bonds between water molecules and oxalate anions of neighboring chains, leading to a two-dimensional network parallel to (100).