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Volumn 13, Issue 25, 2007, Pages 7075-7084

Ligand versus metal protonation of an iron hydrogenase active site mimic

Author keywords

Density functional calculations; Electrochemistry; Enzyme models; Hydride ligands; Tautomerism

Indexed keywords

ENZYME MODELS; HYDRIDE LIGANDS; PHOSPHINE LIGANDS; TAUTOMERISM;

EID: 34548294904     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200700019     Document Type: Article
Times cited : (128)

References (57)
  • 9
    • 4544312297 scopus 로고    scopus 로고
    • In particular, we have recently become interested in the potential application of hydrogenase mimics as molecular catalysts in light-driven hydrogen production, see
    • In particular, we have recently become interested in the potential application of hydrogenase mimics as molecular catalysts in light-driven hydrogen production, see: S. Ott, M. Kritikos, B. Åkermark, L. Sun, Angew. Chem. 2003, 115, 3407-3410;
    • (2003) Angew. Chem , vol.115 , pp. 3407-3410
    • Ott, S.1    Kritikos, M.2    Åkermark, B.3    Sun, L.4
  • 10
    • 0043269716 scopus 로고    scopus 로고
    • Angew. Chem. Int. Ed. 2003, 42, 3285-3288;
    • (2003) Chem. Int. Ed , vol.42 , pp. 3285-3288
    • Angew1
  • 24
    • 4544329387 scopus 로고    scopus 로고
    • Angew. Chem. Int. Ed. 2004, 43, 1006-1009.
    • (2004) Chem. Int. Ed , vol.43 , pp. 1006-1009
    • Angew1
  • 26
    • 34548335753 scopus 로고    scopus 로고
    • Decoupling of the phosphorus nuclei results in a singlet instead of the doublet
    • Decoupling of the phosphorus nuclei results in a singlet instead of the doublet.
  • 28
    • 34548307808 scopus 로고    scopus 로고
    • In analogy to the 1H NMR spectrum, further signals of considerably smaller amplitude are found at higher frequency for the geometrical isomer
    • 1H NMR spectrum, further signals of considerably smaller amplitude are found at higher frequency for the geometrical isomer.
  • 29
    • 34548320186 scopus 로고    scopus 로고
    • As a result of the various dynamic restrictions, the aliphatic region is rather convoluted and is difficult to interpret
    • As a result of the various dynamic restrictions, the aliphatic region is rather convoluted and is difficult to interpret.
  • 33
    • 0035805318 scopus 로고    scopus 로고
    • Angew. Chem. Int. Ed. 2001, 40, 1768-1771.
    • (2001) Chem. Int. Ed , vol.40 , pp. 1768-1771
    • Angew1
  • 36
    • 34548349853 scopus 로고    scopus 로고
    • Identical results were obtained with HCl diluted in acetonitrile from either aqueous stock solution (12M) or stock solution in ethanol 1.25M
    • Identical results were obtained with HCl diluted in acetonitrile from either aqueous stock solution (12M) or stock solution in ethanol (1.25M).
  • 37
    • 34548305756 scopus 로고    scopus 로고
    • To rule out any catalytic effect from fluoride contamination the triflic acid was treated with calcium triflate with no detectable effect on the rate of hydride formation
    • To rule out any catalytic effect from fluoride contamination the triflic acid was treated with calcium triflate with no detectable effect on the rate of hydride formation.
  • 38
    • 0002288783 scopus 로고
    • See, for example:, and references therein
    • See, for example: R. G. Pearson, Chem. Rev. 1985, 85, 41-49, and references therein.
    • (1985) Chem. Rev , vol.85 , pp. 41-49
    • Pearson, R.G.1
  • 39
    • 34548313014 scopus 로고    scopus 로고
    • 1 for the Fe-H bond. The kinetic data obtained with different batches of deuteratcd triflic acid were, however, too scattered to be conclusive.
    • 1 for the Fe-H bond. The kinetic data obtained with different batches of deuteratcd triflic acid were, however, too scattered to be conclusive.
  • 41
    • 34548325353 scopus 로고    scopus 로고
    • With the given bulk concentrations (Coacid/C ocat, 10) and scan rate (0.1 Vs 1) a turnover rate in the order of 102S-1 can be estimated from Saveant's kinetic zone diagram
    • -1 can be estimated from Saveant's kinetic zone diagram.
  • 42
    • 34548362621 scopus 로고    scopus 로고
    • This corresponds to a bimolecular rate constant of the order of 10 4M-1s-1 for a rate-limiting step that is first order in acid
    • -1 for a rate-limiting step that is first order in acid.
  • 44
    • 34548323258 scopus 로고    scopus 로고
    • Given the unfavorable relative positions of the proton on the adt ligand and the bridging hydride, it appears more likely that the hydride is attacked by a bulk proton in a bimolecular reaction rather than by the adt proton in an intramolecular reaction
    • Given the unfavorable relative positions of the proton on the adt ligand and the bridging hydride, it appears more likely that the hydride is attacked by a bulk proton in a bimolecular reaction rather than by the adt proton in an intramolecular reaction.
  • 45
    • 34548359880 scopus 로고    scopus 로고
    • -1 for a rate-limiting step that is first order in acid.
    • -1 for a rate-limiting step that is first order in acid.
  • 46
    • 34548313015 scopus 로고    scopus 로고
    • 2+) around -1.6 V that increase with higher acid concentrations. This might indicate that rapid turnover can be triggered at more negative potentials, which generates the doubly reduced hydride complexes that should be more reactive towards protons.
    • 2+) around -1.6 V that increase with higher acid concentrations. This might indicate that rapid turnover can be triggered at more negative potentials, which generates the doubly reduced hydride complexes that should be more reactive towards protons.
  • 48
    • 34548364700 scopus 로고    scopus 로고
    • 2 (p = 1 bar) even with millimolar concentrations of acid.
    • 2 (p = 1 bar) even with millimolar concentrations of acid.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.