Acta Crystallographica Section B

Structural Science, Crystal Engineering and Materials

Volume 69, Part 6 (December 2013)

research papers

Acta Cryst. (2013). B69, 613-620    [ doi:10.1107/S2052519213029618 ]

Supramolecular association via Sb...S and C-H...S interactions in dimeric tris(N,N-dimethyldithiocarbamato-S,S')antimony(III): an approach to overcome the concept of steric bulk on such interactions

H. P. S. Chauhan and J. Carpenter

Abstract: Tris(N,N-dimethyldithiocarbamato-S,S')antimony(III) has been isolated as a dimer in acetonitrile. Single-crystal X-ray analysis shows that the molecule possesses both Sb...S and C-H...S interactions, which results in a supramolecular association in the absence of hydrogen-bonding functionality on the R group. The co-existence in the title compound of such interactions is a unique character of known dimeric antimony(III) alkyl and/or aryl dithiocarbamate complexes. The literature reveals that the species where the alkyl and/or aryl dithiocarbamates carry the following groups: R = methyl (chloroform solvated), ethyl, n-propyl, pyrrolidine, morpholine, piperidine, azepane, benzyl, methylphenyl, are not capable of forming significant hydrogen-bonding interactions. However, either Sb...S or C-H...S intermolecular interactions dominate between two centrosymmetrically related molecules leading to a supramolecular aggregation. In the species where the R group carries hydrogen-bonding functionality, i.e. 2-hydroxylethyl, the C-H...S interactions are subverted by O-H...O hydrogen bonding. In addition, the title compound does not have steric hindrance or any hydrogen-bonding group but is stabilized with the co-existence of Sb...S and C-H...S interactions. Analysis of the secondary interactions of a series of analogues previously reported reveals that steric bulk is unnecessary for the mitigation of Sb...S interactions and for the establishment of C-H...S secondary bonding.

CCDC reference: 968765

Keywords: supramolecular interactions; dimeric structure; hydrogen bonding.

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