Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 35, Pages 12213-12216Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja5051605
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Funding
- National Basic Research Program of China [2013CB922102]
- U.S. National Science Foundation [CHE-1012173, DMR 1157490]
- Natural Science Foundation of Jiangsu Province of China [BK2011778]
- State of Florida
- Department of Energy
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1012173] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1362548] Funding Source: National Science Foundation
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The quest for the single-molecular magnets (SMMs) based on mononuclear transition-metal complexes is focused on the low-coordinate species. No transition-metal complex with a coordination number of eight has been shown to exhibit SMM properties. Here the magnetic studies have been carried out for a mononuclear, eight-coordinate cobalt(II)-12-crown-4 (12C4) complex [Co-II(12C4)(2)](I-3)(2)(12C4) (1) with a large axial zero-field splitting. Magnetic measurements show field-induced, slow magnetic relaxation under an applied field of 500 Oe at low temperature. The magnetic relaxation time tau was fitted by the Arrhenius model to afford an energy barrier of U-eff = 17.0 cm(-1) and a preexponential factor of tau(0) = 1.5 X 10(-6) s. The work here presents the first example of the eight-coordinate, mononudear, 3d metal complex exhibiting the slow magnetic relaxation.
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