Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 129, Issue 4, Pages 760-761Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja068017q
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- Engineering and Physical Sciences Research Council [GR/T28652/01] Funding Source: researchfish
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A prerequisite to understand and subsequently to allow applications of the magnetic properties of polymetallic exchange coupled systems is a detailed insight into the magnetic properties of their elementary building blocks and the interaction between them. Such an understanding passes through the quantification of the relative contributions of single-ion and exchange terms to the overall magnetic properties of the system. In the general case, the quantification of these two kinds of contributions is possible when numerous spin-states are experimentally observed since single-ion and exchange terms project differently on the ground and various excited spin-states of an exchange coupled system. We present here highly resolved multifrequency (X-, K-, and Q-band) CW-EPR spectra obtained on a heterooctametallic ring [Me2NH2][Cr(III)(7)Cd(II)F-8((CH3)(3)CCOO)(16)] (1). The spectra of 1 provide a rare example of a polymetallic system where detailed information on the spin-Hamiltonian parameters of excited spin-states is experimentally observed. Analysis of these spectra allowed the direct quantification of the contributions of single-ion and exchange anisotropy terms to the magnetic properties of the system.
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