Crystal and molecular structure of tin(IV) dithiocarbamates: III. Tris(N,N-diethyl-dithiocarbamato)n-butyltin(IV)

Abstract

The crystal structure of the title compound has been determined from 1623 independent reflections measured by scintillation methods. The compound cyrstallizes in the monoclinic space groupP2₁/c witha = 10.60(2),b = 18.40(5),c = 17.05(3) Å, β = 116.7(2) °, andZ = 4. The structure was solved by Patterson and Fourier techniques and was refined by full-matrix least-squares methods toR = 0.066. As in tris(N, N-diethyldithiocarbamato)-methyltin(IV) the crystal structure consists of discrete, neutral, sevencoordinated tin complexes. The distorted pentagonal bipyramidal geometry of the tin atom is almost identical to that in the methyl complex, being formed by two sulfur atoms from each dithiocarbamate and a carbon atom of the butyl group which occupies one of the axial positions. Each dithiocarbamate ligand again has one Sn-S distance significantly shorter than the other. For the equatorial ligands the average difference is 0.18 Å with the minimum Sn-S distance 2.619(7) Å and the maximum 2.860(6) Å. For the ligand which bridges axial-equatorial, the Sn-S axial distance is 2.491(6) Å, while the Sn-S equatorial distance is 2.763(8) Å. The axial S-Sn-C angle is 166.3(5) °. The results are compared with those for other seven-coordinated tin(IV) structures and seven coordinated dithiocarbamate complexes of other metals.