Highly reactive μ-carbido diiron tetraphenylporphine oxo-species: chemical generation and the oxidation ability
The multistep interaction of a μ-carbido diiron tetraphenylporphine complex and its imidazole derivative with tert-butylhydroperoxide tBuOOH were investigated in benzene at 298 K by UV–visible, IR spectroscopy and electrochemical study. The kinetics of the
stepwise processes were studied and their rate constants k were obtained. The reaction of both non-ligated [FeIVTPP]2C (1) and [ImFeIVTPP]2C (2) with tBuOOH led to high-oxidized species generation following the coordination
of a peroxide molecule on the metal center (k
1 = 2.8 M−1s−1) and homolytic cleavage of O–O bond in attached tBuOOH (k
2 = 3.1 s−1 for 1, k
2 = 12.8 s−1 for 2). [FeIVTPP]2C underwent one-electron ring oxidation to form a π-cation radical (k
ox = 3.9 s−1) detected by UV–visible and IR spectroscopy.
Imidazole-derivative formed a powerful oxidizing species that is able to oxidize the organic peroxide employed. The oxidant-intermediate reacting rapidly when produced in solution was proposed to be double-oxidized species due to its high reactivity (k
red = 2660
M−1s−1). The results of UV–visible, IR, ESI-MS study supported the final products with Fe = C=Fe unit.
Keywords: axial coordination; highly-oxidized species; kinetics; organic peroxide; oxidation; µ-Carbido-bis[(tetra-phenylporphinato)iron(IV)]
Document Type: Research Article
Affiliations: 1: G. A. Krestov Institute of Solution Chemistry of the Russian Academy of Science, Ivanovo, Russian Federation; 2: Ivanovo State University of Chemistry and Technology, Ivanovo, Russian Federation
Publication date: 17 September 2018
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