Blacque, Olivier and Brunner, Henri and Kubicki, Marek M. and Lucas, Dominique and Meier, Walter and Mugnier, Yves and Nuber, Bernd and Stubenhofer, Bernhard and Wachter, Joachim (1998) Syntheses and properties of tetrathio- and tetraseleno metalates [(C5Me4R)2NbE2]2M (E=S, Se; M=Cr, Mo; R=Me, Et) with peripheric niobocene ligands. JOURNAL OF ORGANOMETALLIC CHEMISTRY, 564 (1-2). pp. 71-79. ISSN 0022-328X, 1872-8561
Full text not available from this repository.Abstract
Reactions of Cp-2*Nb(eta(2)-S-2)H 1 (Cp* = C5Me5 (a), C5Me4Et (b)) and Cp-2*Nb(eta(2)-Se2H) 3 with 0.5 equivalents of M(CO)(6) (M = Cr, Mo) in boiling toluene give the CO free complexes [Cp-2*NbE2](2)M 4-7. X-ray diffraction analyses have been carried out for the Mo complexes 5a (E = S) and 7a (E = Se) showing that the structures contain ME4 tetrahedral cores with two attached niobocene ligands thus forming a nearly linear trimetallic unit. Absorption spectra and electrochemical studies of complexes 4-7 are described. Characteristic of the novel CrSe4 chromophor are four reversible one electron redox steps. Chemical oxidation of 4a and 5a with [(C5H5)(2)Fe]PF6 gives the salts {[Cp-2*NbS2](2)M}PF6 (M = Cr, Mo) 10 and 11. A qualitative EHMO analysis provides evidence for a strong delocalisation of electron density over the whole metal-ligand system. (C) 1998 Elsevier Science S.A. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PERALKYLATED NIOBOCENE; TRINUCLEAR COMPLEXES; OXIDATION-STATES; DERIVATIVES; REACTIVITY; CHEMISTRY; CLUSTERS; SULFUR; CP-ASTERISK=ETA(5)-C(5)ME(5); TRANSITION; niobocene; sulfur; selenium; polymetal complexes |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Arbeitskreis Dr. Joachim Wachter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2023 10:46 |
| Last Modified: | 16 Feb 2023 10:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49599 |
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