Face versus vertex co-ordination of tridentate crown thioethers to trinuclear cobalt clusters
作者:Corinne Renouard、Gerd Rheinwald、Helen Stoeckli-Evans、Georg Süss-Fink、Dario Braga、Fabrizia Grepioni
DOI:10.1039/dt9960001875
日期:——
The co-ordination of the six-membered crown thioethers 1,3,5-trithiane, 2-methyl-,2,4-dimethyl-,2,4,6-tridethyl-, 2-benzyl- and 2,4,6-tribenzyl-1,3,5-tirithiane and the nine-membered crown thioether 1,4,7-trithiacyclononane to the cobalt skeleton-of various Co3C clusters was studied. With trithiane and its derivatives complexes of the type [Co-3(CO)(6)(mu(3)-CR)(mu(3)-SCHR(1)SCHR(2)SCHR(3))] (R = Cl, Me or Ph; R(1)-R(3) = H, Me or CH(2)Ph) were obtained, whereas the nine-membered crown thioether gave compounds of the type [Co-3(CO)(5)(mu-CO)(mu(3)-CR)(SCH2CH2)(3)}]. The molecular and crystal structures of several representatives have been investigated by single-crystal X-ray diffraction. It has been shown that the trithiane ligand invariably occupies the axial co-ordination sites on the three cobalt atoms, while the trithiacyclononane chelates on one cobalt atom. The intermolecular networks of hydrogen-bonding interactions of the C-H ... O type between the thioether hydrogens and the do ligands have been investigated and compared with those present in other crystalline clusters carrying thioether ligands.