Naslov
Observation of symmetry lowering and electron localization in the doublet-states of a spin-frustrated equilateral triangular lattice: Cu3(O2C16H23)center dot 1.2C6H12

Autori
Cage, Brant ; Cotton, F Albert ; Dalal, Naresh S ; Hillard, Elizabeth A ; Rakvin, Boris ; Ramsey, M.Chris

Izvornik
Journal of the American Chemical Society (0002-7863) 125 (2003), 18; 5270-5271

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Pyrococcus-furiosus ferredoxin; Single-molecule magnets; Manganese carboxylate; Magnetization; Clusters; Crystal; Relaxation; Nanomagnet; Behavior; Complex

Sažetak
Cu3(O2C16H23)6 center dot 1.2C6H12, containing a Cu36+ core in an equilateral triangle geometry, has been found to be a versatile model system for investigating the spin-frustration phenomenon in a triangular lattice. It affords well-resolved EPR spectra from both of the two possible (Stotal = 1/2 and 3/2) spin states of the Cu36+ core. From 295 to 100 K, the spectra consist of a triplet, but with the central line overlapped by an additional, sharp peak, which replaces the triplet at 30 K and below. The triplet was thus assigned to the excited state with Stotal = 3/2, located at 324 &plusmn ; ; ; 5 K (~225 cm-1), with the zero-field parameters D = -535 G, E = 0, g = 2.209 and g = 2.057. The singlet was attributed to the Stotal = 1/2 state, with gxx = 2.005, gyy = 2.050, gzz = 2.282, and, surprisingly, a hyperfine splitting arising from a single Cu2+ nucleus, with Azz = 157 G. The detailed magnetic measurements on a three-electron, equilateral triangular system, and the observation of symmetry lowering in the doublet ground state, should be of broad theoretical and experimental interest in molecular magnetism.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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