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Reduction of monophosphaallenes: An EPR study and ab inition investigations of (HPCCH2)-. and (HPCHCH2). radicals

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Published in Journal of Physical Chemistry. A. 1998, vol. 102, no. 51, p. 10469-10475
Abstract Cyclic voltammetry shows that monophosphaallene ArPCC(C6H5)2 (where Ar = C6H2tBu3-2,4,6), 1a, undergoes irreversible reduction at 2266 mV in THF. The EPR spectra of the reduction products are obtained in liquid and frozen solutions after specific 13C enrichment of the allenic carbon atoms. The resulting hyperfine tensors are compared with those obtained from ab initio MP2, MCSCF, CI, and DFT calculations for the radical anion (HPCCH2)-• and for the monophosphaallylic radical (HP•−CHCH2) ↔ (HPCH−•CH2). The most elaborate treatments of the hyperfine structure (CI and DFT) indicate that the species observed by EPR is the monophosphaallylic radical.
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Research groups Groupe Geoffroy
Groupe Weber
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CHENTIT, Mostafa et al. Reduction of monophosphaallenes: An EPR study and ab inition investigations of (HPCCH2)-. and (HPCHCH2). radicals. In: Journal of Physical Chemistry. A, 1998, vol. 102, n° 51, p. 10469-10475. https://archive-ouverte.unige.ch/unige:2767

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Deposited on : 2009-09-21

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