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EPR Studies of (3, 5‐ di‐t ‐Butyl‐0‐Benzoquinone) Tetracarbonylrhenium(0) Radical
Author(s) -
Cheng C. P.,
Wang S. R.,
Chou T. C.
Publication year - 1986
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198600013
Subject(s) - chemistry , triphenylphosphine , rhenium , electron paramagnetic resonance , unpaired electron , medicinal chemistry , photochemistry , benzoquinone , radical , inorganic chemistry , catalysis , organic chemistry , nuclear magnetic resonance , physics
The organometallic radical: (3,5‐ di‐t ‐butyl‐0‐benzoquinone)tetracarbonyl‐rhenium(0) and its triphenylphosphine substituted derivatives were studied by EPR spectroscopy. The unpaired electron is shown to be localized in the organic 1,2‐diketone ligand. The rate of carbonyl substitution by triphenylphosphine at the unsubstituted rhenium radical indicates a second order reaction. The activation parameters are Δ H * =19.1±0.8 Kcal/mole and Δ S *‐3.0±1.5 eu/mole.