N. Kuhn et al., HETEROCYCLES AS LIGANDS .22. 2-CHALCOGENO IMIDAZOLINES AS LIGANDS IN PENTACARBONYLMETAL COMPLEXES, Phosphorus, sulfur and silicon and the related elements, 108(1-4), 1996, pp. 107-119
The chalcogenoimidazoline complexes NR-CMe-CMe-NR-C=X . M(CO)(5) (VIII
-XI; R = Me, iso-Pr; X = S, Se, Te; M = Cr, Mo, W) are obtained from t
he metal hexacarbonyls (M = Cr, Mo, W) and the chalcogenoimidazolines
IV-VIL. ln these complexes the chalcogeno ligands exhibit strong donor
properties according to the sequence Te > Se > S which is demonstrate
d by n. m. r. and i. r. data. The X-ray structures of N(iso-Pr)-CMe-CM
e-N(iso-Pr)-C=X . Cr(CO)(5)(X = S; Se; VIIIa, IXa) are reported.