Magnetic resonance of the new neutral Al cluster radical [Al7R6]S. Domingo Köhler1, B. Pilawa1, D. Saez de Jauregui1, G. Fischer1, R. Grubba2, R. Köppe2, A. Schnepf2, H. Schnöckel2 and E. Dormann1
1 Physikalisches Institut, Universität Karlsruhe (TH) - D-76128 Karlsruhe, Germany, EU
2 Institut für Anorganische Chemie, Universität Karlsruhe (TH) - D-76128 Karlsruhe, Germany, EU
received 19 December 2007; accepted in final form 5 March 2008; published May 2008
published online 16 April 2008
Static magnetometry and continuous-wave and pulsed-electron spin resonance (ESR) is used for the characterization of the neutral radical cluster [Al(Al3R3)2] (R = N(SiMe2Ph)2). For temperatures below 25 K, we prove its monoradical character, a g-factor of 1.9971.991, and a three time larger hyperfine interaction with the central than with the six outer 27Al nuclei of the [Al7R6] cluster radical. Temperature dependence of the low-temperature spin-lattice relaxation is analysed. At temperatures above 30 K, the effective moment per cluster increases, and the hyperfine interaction with the seven 27Al nuclei is equalized.
76.30.-v - Electron paramagnetic resonance and relaxation.
76.30.Rn - Free radicals.
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