Electron-transfer Chain Catalysis in Phosphine Replacement Reaction: Determination of Relative Donor Capability of Arylpyridylphosphines
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Date
2007-01-20
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Abstract
The slight differences in the donor capabilities of PPhnPy3 n (n = 0–3) could be measured directly in the equilibrium of phosphine
replacement reaction on (g5
-C5H5)Fe(CO)2-phosphine complexes, taking advantage of the radical pathway to establish equilibrium rap idly. The simultaneous determination of equilibrium constants is done in a single experiment. The donor capability increases in the order
PPh3 < PPh2Py < PPhPy2 < PPy3 with quantified ðg5-C5H5ÞFeðCOÞ2
þ-affinity scales at 1, 4.90, 11.0, and 20.3, respectively.
2006 Elsevier B.V. All rights reserved
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Keywords
Electron-transfer chain catalysis, Arylpyridylphosphines, Radical process, Iron complexes, Phosphine exchange, Cyclic voltammetry