Reactivity of [Re2(CO)8(MeCN)2] with thiazoles: Hydrido bridged dirhenium compounds bearing thiazoles in different coordination modes |
| |
Authors: | Shariff E Kabir Faruque Ahmed Mohammad R Hassan Sergey V Lindeman Tasneem A Siddiquee |
| |
Institution: | a Department of Chemistry, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh b Department of Chemistry, Marquette University, Milwaukee, WI 53201-1881, USA c Department of Chemistry, Dhaka University, Dhaka-1000, Bangladesh d Department of Chemistry, University of Wisconsin-Milwaukee, P.O. Box 413, WI 53211-3029, USA |
| |
Abstract: | Reactions of the labile compound Re2(CO)8(MeCN)2] with thiazole and 4-methylthiazole in refluxing benzene afforded the new compounds Re2(CO)7{μ-2,3-η2-C3H(R)NS}{η1-NC3H2(4-R)S}(μ-H)] (1, R = H; 2, R = CH3), Re2(CO)6{μ-2,3-η2-C3H(R)NS}{η1-NC3H2(4-R)S}2(μ-H)] (3, R = H; 4, R = CH3) and fac-Re(CO)3(Cl){η1-NC3H2(4-R)S}2] (5, R = H; 6, R = CH3). Compounds 1 and 2 contain two rhenium atoms, one bridging thiazolide ligand, coordinated through the C(2) and N atoms and a η1-thiazole ligand coordinated through the nitrogen atom to the same Re as the thiazolide nitrogen. Compounds 3 and 4 contain a Re2(CO)6 group with one bridging thiazolide ligand coordinated through the C(2) and N atoms and two N-coordinated η1-thiazole ligands, each coordinated to one Re atom. A hydride ligand, formed by oxidative-addition of C(2)-H bond of the ligand, bridges Re-Re bond opposite the thiazolide ligand in compounds 1-4. Compound 5 contains a single rhenium atom with three carbonyl ligands, two N-coordinated η1-thiazole ligands and a terminal Cl ligand. Treatment of both 1 and 2 with 5 equiv. of thiazole and 4-methylthiazole in the presence of Me3NO in refluxing benzene afforded 3 and 4, respectively. Further activation of the coordinated η1-thiazole ligands in 1-4 is, however, unsuccessful and results only nonspecific decomposition. The single-crystal XRD structures of 1-5 are reported. |
| |
Keywords: | Rhenium carbonyl Oxidative addition Thiazolide N-coordinated thiazole X-ray structures |
本文献已被 ScienceDirect 等数据库收录! |
|