Trinucleating Copper: Synthesis and Magnetostructural Characterization of Complexes Supported by a Hexapyridyl 1,3,5-Triarylbenzene Ligand

Authors

  • Emily Y. Tsui,

    1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (USA)
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  • Dr. Michael W. Day,

    1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (USA)
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  • Prof. Theodor Agapie

    Corresponding author
    1. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (USA)
    • Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125 (USA)
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  • We thank Lawrence M. Henling for crystallographic assistance, David Vandervelde for help with NMR experiments, and Harry Gray, Jay Winkler and Liviu Mirica for stimulating discussions. We are grateful to Caltech and NSF GRFP (E.Y.T.) for funding. The Bruker KAPPA APEXII X-ray diffractometer was purchased through an NSF CRIF:MU award to Caltech, CHE-0639094. SQUID data were collected at the MMRC of the Beckman Institute of the California Institute of Technology.

Abstract

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Copper threesome: A hexapyridyl ligand based upon a 1,3,5-triphenylbenzene framework coordinates three metal centers in a constrained environment (see picture). The tricopper(I) complex reduces dioxygen to form a tricopper(II) cluster. The capping anions affect the magnetism and EPR spectra of these species and reveal a linear dependence between the antiferromagnetic exchange parameter and the Cu-O-Cu angles.

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