Abstract

The molecular nanomagnet [LiFe6(OCH3)12(dbm)6]B(C6H5)4⋅5CH2Cl2 (Fe6:Li in short) is formed by six Fe(III) s=5/2 spins arranged in an almost coplanar ring with antiferromagnetic (AFM) nearest-neighbor coupling constant J/kB∼20 K. We report 7Li nuclear magnetic resonance (NMR) spectra and nuclear spin-lattice relaxation rate (NSLR) measurements as a function of temperature from 1.5 to 50 K with applied field H=1.5 T. No evidence of quadrupole effects was found on the 7Li NMR spectrum within the linewidth resolution (∼25 kHz) ruling against a molecular distortion. The 7Li NSLR is compared with the 1H NSLR results in Fe6:Li and in other AFM rings.

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