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Details van artikel 12 van 86 gevonden artikelen
| Titel: |
Bimetallic Complexes with Bridging Dithiaalkane Ligands: Preparation and Kinetic Study |
| Auteur: |
Asali, Khalil El-Khateeb, Mohammad Musa, Musa |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 55 (2002) nr. 10 pagina's 1199-1207 |
| Jaar: |
2002 |
| Inhoud: |
Reactions of M(CO)5THF, which was generated photochemically from M(CO)6 in THF, with (CH3)3CS(CH2)nSC(CH3)3 (=SS; n=5, 6; M=W, Cr) at room temperature afforded exclusively the bimetallic complexes (CO)5MSSM(CO)5. These new complexes with dithiaalkane bridging ligands have been characterized by IR and 1H NMR spectroscopies and elemental analysis. Kinetic studies of ligand-exchange reactions in these complexes in chlorobenzene (=CB) solutions employing tri(iso-propyl)phosphite (=L) as an incoming nucleophile indicated that the bridging ligand SS is replaced by L to afford finally (CO)5MP(O-i-Pr)3 as the sole reaction product. The kinetic data have also confirmed that replacement of SS by L under pseudo-first-order reaction conditions is dissociative and proceeds via a mechanism which involves initial M-S bond breaking followed by other steps. First order rate constants and activation parameters for these reactions have been determined. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 12 van 86 gevonden artikelen
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