American Chemical Society
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Single-Molecule Magnets:  A Mn25 Complex with a Record S = 51/2 Spin for a Molecular Species

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journal contribution
posted on 2004-04-21, 00:00 authored by Muralee Murugesu, Malgorzata Habrych, Wolfgang Wernsdorfer, Khalil A. Abboud, George Christou
The reaction of MnCl2·4H2O (3 equiv), pyridine-2,6-dimethanol (pdmH2) (10 equiv), and NaN3 (10 equiv) in MeOH/MeCN (1:2 v/v) with NMe4OH (1 equiv) gave [Mn25O18(OH)2(N3)12(pdm)6(pdmH)6](Cl)2·12MeCN (1·12MeCN) in ∼30% yield. The cation of complex 1 comprises five Mnx layers of three types in an ABCBA arrangement. Fitting of variable-temperature and -field magnetization data establishes that 1 has an S = 51/2 ground state, the largest value for a molecular species. The complex also displays hysteresis loops below 0.6 K in magnetization vs applied field sweeps, establishing it as the largest spin single-molecule magnet to date.