Triphenyltin(IV) 8-quinolyloxyacetate hydrate, [Ph 3SnO 2CCH 2(8-C 9H 6NO) · H 2O] n, an organotin ester derivative built of hydrogen-bonded helical chains

Abstract

The X-ray crystal structure of triphenyltin(IV) 8-quinolyloxyacetate hydrate, [Ph 3SnO 2CCH 2(8-C 9H 6NO) · H 2O] n , has been determined and refined to R F = 0.066. The compound crystallizes in space group P2 1/ c with a 13.667(5), b 10.340(5), c 35.92(1) Å, β 93.01(3)° and Z = 8. The asymmetric unit consists of two independent [Ph 3SnO IC(O II)CH 2(8-C 9H 6NO III) · H 2O IV] molecular units ( A and B) which differ in the extent of the intramolecular approach of the carbonyl oxygen O II to tin (Sn ⋯ O II 3.53(1) and 3.20(1) Å, respectively). The coordination environments of tin in A and B are in each case essentially trigonal bypyramidal, with the ipso-carbons of the phenyl groups lying in the equatorial plane and the axial positions being occupied by oxygen from a unidentate carboxylate group and a water molecule. The SnO bond lengths involving coordinated water are approximately 0.22 Å longer than those involving the carboxylate groups; the axial angles, O ISnO IV, in A and B are respectively 175.9(3) and 176.6(3)°. Molecules A and B are linked sequentially by hydrogen bonds involving the coordinated water molecule and the quinolyloxyacyl O III and N atoms to form one-dimensional helical chains parallel to the a axis. The slope of the variable-temperature 119mSn Mössbauer plot ( a = dln( A T A 80 K)/d T = −1.99 X 10 −2 K −1 for 80 ≤ T ≤ 110) is consistent with the model of a weakly associated lattice.