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Single-crystal EPR study and DFT structure of the [Mo(CO)5PPh3]+· radical cation

Published inJournal of physics and chemistry of solids, vol. 70, no. 3-4, p. 713-718
Publication date2009

A radical species characterized by a large g-anisotropy and a clearly resolved hyperfine structure with 95/97Mo and 31P nuclei is formed, at 77 K, by radiolysis of a single crystal of Mo(CO)5PPh3. The corresponding EPR signals disappear irreversibly with increasing temperature and the angular dependence of the various coupling constants imply a spin delocalization of not, vert, similar60% and not, vert, similar4% on the molybdenum and the phosphorus atoms, respectively and are, a priori, consistent with the trapping of a one-electron deficient centre. The ability of DFT to predict the EPR tensors for a 17-electron Mo(I) species is verified by calculating the g-tensor and the various 14N and 13C coupling tensors previously reported by Hayes for [Mo(CN)5NO]3−. Calculations at the B3LYP/ZORA/SOMF level of theory show that, in contrast to Mo(CO)5PH3, one-electron oxidation of Mo(CO)5PPh3 causes an appreciable change in the geometry of the complex. The g-tensor and the 95/97Mo and 31P isotropic and anisotropic coupling constants calculated for [Mo(CO)5PPh3]+· confirm the trapping of this species in the irradiated crystal of Mo(CO)5PPh3; they also show that the conformational modifications induced by the electron release are probably hindered by the nearby complexes.

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SIDORENKOVA CRUZ GONZALEZ, Elena et al. Single-crystal EPR study and DFT structure of the [Mo(CO)5PPh3]+· radical cation. In: Journal of physics and chemistry of solids, 2009, vol. 70, n° 3-4, p. 713–718. doi: 10.1016/j.jpcs.2009.02.010
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ISSN of the journal0022-3697

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Creation10/02/2009 3:18:01 PM
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