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Volumn 273, Issue 5283, 1996, Pages 1848-1850

A trinuclear intermediate in the copper-mediated reduction of O2: Four electrons from three coppers

Author keywords

[No Author keywords available]

Indexed keywords

COPPER; OXIDOREDUCTASE; OXYGEN;

EID: 0029744369     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.273.5283.1848     Document Type: Article
Times cited : (258)

References (40)
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    • note
    • The (1R,2R)-cyclohexanediamine backbone was chosen both for its preorganized nature and its chirality. In its energetically preferred conformation with the two amine substituents equatorially positioned, this ligand is preorganized for binding a single metal. The enantiomeric purity of the ligand significantly reduces the probability of forming diastereomeric complexes.
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    • note
    • 3CN has also been structurally characterized as a trigonal planar species (18).
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    • 2 at below-ambient temperatures, consistent with other reports
    • 2 at below-ambient temperatures, consistent with other reports.
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    • 3TACN = 1,4,7-tribenzyl-1,4,7-triazacyclononane).
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    • Supporting information is available from the author or at the Science Web site http://www.sciencemag. org/ science/feature/beyond/#cole. Included are synthetic procedures and spectroscopic characterization data for all new compounds and x-ray structural information, including tables of crystal collection data, positional and thermal parameters, and interatomic distances and angles.
    • Science
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    • Isolated yield, 60%. The x-ray crystal data is available (78)
    • Isolated yield, 60%. The x-ray crystal data is available (78).
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    • note
    • w = 7.6.
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    • 2 core)
    • 2 core).
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    • The structure of 2 bears a strong superficial resemblance to that of a previously reported macrocyclic bis(μ3-hydroxo)tricopper(ll) species; however, this thermally stable cluster exhibits full threefold symmetry, has normal Cu(II)-O and Cu(II)-N distances, and carries an overall charge of 4+ [J. Comarmond, B. Dietrich, J. Lehn, R. Louis, Chem. Commun. 1985, 74 (1985)].
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    • note
    • 3-oxotricopper(II) species would also be consistent with an overall charge of 3+ but fails to rationalize the short Cu-O bonds exhibited by the unique Cu site.
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    • note
    • We thank the University of California Mass Spectrometry Facility (Department of Pharmaceutical Chemistry, San Francisco); Z. Hou and V. Mahadevan for experimental assistance; and F. Hollander for use of the Siemens SMART diffractometer at the University of California at Berkeley. Funding provided by NIH grants GM50730 (T.D.P.S.) and DK31450 (E.I.S.) and an NSF predoctoral fellowship (A.P.C.).


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