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Four-Site Cooperative Spin Crossover in a Mononuclear FeII Complex

Authors

  • Dr. Anders Lennartson,

    1. Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense (Denmark)
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  • Prof. Andrew D. Bond,

    Corresponding author
    1. Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense (Denmark)
    • Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense (Denmark)
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  • Dr. Stergios Piligkos,

    1. Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark)
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  • Prof. Christine J. McKenzie

    Corresponding author
    1. Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense (Denmark)
    • Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense (Denmark)
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  • We thank the Danish Council for Independent Research/Natural Sciences for financial support (grant no. 272-08-0436) to C.J.M. and for a Sapere Aude fellowship (10-081659) to S.P. The sequential variable-temperature diffraction data were collected at the application laboratory of Agilent Technologies, Abingdon, U.K., with the hospitality and assistance of Dr. Marcus Winter and Dr. Alex Griffin.

Abstract

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Round and round: A mononuclear FeII complex (see picture) with an N4S2 coordination set has been characterized in four polymorphic forms. Two of the polymorphs display four-site cooperative spin crossover (SCO), shown conclusively by the crystal structure of a fully ordered 1:3 high-spin/low-spin state. The presence of S donor atoms in SCO-active compounds is unusual, and further investigation of FeII complexes for SCO activity is warranted.

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