Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 8, Pages 2444-2445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja710773u
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In the overwhelming majority of the exchange-coupled clusters investigated in field of molecular magnetism, the exchange interaction is constant on temperature. ''Breathing'' crystals of composition Cu(hfac)(2)L-R undergo temperature-induced reversible structural rearrangements accompanied by significant changes of the effective magnetic moment. Using high-field (W-band) EPR, we provide a solid proof of drastic temperature dependence of exchange interaction J(T) in these compounds that originates from temperature dependence of inter-spin distances. Strong dependence J(T) revealed by EPR makes Cu(hfac)(2)L-R breathing crystals interesting and promising systems in the research toward creation of molecular-magnetic switches and related spin devices.
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