Journal
INORGANICA CHIMICA ACTA
Volume 361, Issue 11, Pages 3117-3124Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2007.12.020
Keywords
osmium clusters; thiophenes; alkynes; X-ray crystal structures
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The reaction of 2 equiv. of [Os-3(CO)(10)(MeCN)(2)] with R-C C-L-C C-R (R = H, L = (C4H2S); R = SiMe3, L=(C4H2S-C4H2S), (C4H2S-C4H2S-C4H2S), (C4H2S)-(C14H8)-(C4H2S)) affords the series of linked clusters [{Os-3(CO)(10)}( HC C(C4H2S)C CH){Os-3(CO)(10)}] (1), [{Os-3(CO)(10)}(Me3SiC C(C4H2S-C4H2S)C CSiMe3){Os-3(CO)(10)}] (2), [{Os-3(CO)(10)}(Me3SiC C(C4H2S- C4H2S-C4H2S)C CSiMe3){Os-3(CO)(10)}] (4) and [{Os-3(CO)(10)}(Me3SiC C(C4H2S)-(C14H8)-(C4H2S)C CSiMe3){Os-3(CO)(10)}] (6) as the major products. The complexes have been characterised by a range of spectroscopic methods and, in the case of 1 and 2 by single crystal X-ray crystallography. The alkyne groups cap the osmium triangles in the expected mu(3)-eta(2)-||-bonding mode and each triangle is coordinated by nine terminal and one mu(2)-carbonyl group. Solution UV-Vis spectra of the complexes were similar to those observed for the free ligands consistent with there being little delocalisation between the cluster units and the thiophene groups. (c) 2008 Elsevier B.V. All rights reserved.
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