Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 726, Issue -, Pages 9-13Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2012.12.006
Keywords
Iron-sulphur; Hydrogenase model; Electrocatalysis; Hydrogen bonding
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Funding
- Oakland University Kenny Biomedical Science Fellowship
- Provost Research award
- National Science Foundation (NSF) instrumentation award [CHE-0821487]
- faculty start-up grant
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Three variations of the common [FeFe]-Hydrogenase active site mimic mu-(SCH2CH2S)-Fe-2(CO)(6), 1, have been studied: mu-(SCH(CH3)CH2S)-Fe-2(CO)(6), 2; mu-(SCH(CH3)CH(CH3)S)-Fe-2(CO)(6), 3; and mu-(SCH2CH(CH2OH)S)-Fe-2(CO)(6), 4. The electrochemistry of these four species is compared, indicating that 3 displays greater durability upon electrochemical cycling. This enhanced stability is ascribed to steric blockage of decomposition routes, rather than any change to the Fe2S2 butterfly structure. Electrocatalysis using a weak acid (4-tert-butylphenol, pK(a) = 27.5 in acetonitrile) is observed for each catalyst with similar overpotential. The enhanced stability of the reduction products of 3 leads to a modest increase of the apparent catalytic rate. Compound 4 was tested for an enhancement of the rate of the acid deprotonation step; compound 4 failed to behave in such a manner, providing no improvement in electrochemical catalysis compared to the parent compound. (C) 2012 Elsevier B. V. All rights reserved.
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