Journal
INORGANIC CHEMISTRY COMMUNICATIONS
Volume 11, Issue 11, Pages 1401-1404Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.inoche.2008.09.004
Keywords
Phosphenium; Donor-acceptor ligand; Rhodium; Phosphine; Electronic properties
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Funding
- Ministere de la Recherche
- Universite de Bourgogne
- Centre National de la Recherche Scientifique
- Conseil Regional de Bourgogne
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The coordination properties of a donor stabilized-phosphenium adduct have been examined in rhodium chemistry. The preparation as well as the characterization of the first examples of donor stabilized-phosphenium rhodium(I) complexes is reported in this paper. Indeed, mono- and di-cationic rhodium complexes were obtained in quantitative yield by the direct addition of this imidazolium P(III)-ligand to [RhCl(1,5-COD)](2) in CH(2)Cl(2) Solution with a 1: 1 P/Rh ratio under argon and 2:1 P/Rh ratio under CO atmosphere, respectively. Crystal structure of the bis-cationic donor stabilized-phosphenium rhodium(l) complex has been obtained from an acetone/pentane mixture. Its molecular structure has revealed a particular arrangement in which the chloride atom is sandwiched between both imidazolium rings as a result of the electrostatic attractive interactions between the electron-deficient heterocarbene moieties and the electron rich halide atom. On the other hand, the basicity of N-donor-phosphenium adducts has been evaluated by measure of the CO stretching frequency in one rhodium complex, and was found halfway between the phosphites and the strong it-acceptor phosphines. (C) 2008 Elsevier B.V. All rights reserved.
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