Solid State Nuclear Magnetic Resonance 1996-04-01

35Cl NOR and 19F NMR relaxation studies of CClF2 group dynamics in N(CH3)4H(ClF2CCOO)2.

M Zdanowska-Fraczek, W Medycki

Index: Solid State Nucl. Magn. Reson. 6(2) , 141-6, (1996)

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Abstract

The reorientation of CClF2 groups in N(CH3)4H(ClF2CCOO)2 has been studied using pulsed NQR and NMR techniques. The temperature dependence of both chlorine (35Cl) NQR and fluorine (19F) NMR spin-lattice relaxation has been measured T1Q of chlorine is attributed to the sum of two contributions: the reorientation of CClF2 groups and the modulation of the electric field gradient (EFG) produced by the motion of the N(CH3)4+ cations. The activation energies were determined for both kinds of motion. The fluorine relaxation is dominated by an intramolecular 19F-1H dipolar interaction. In analysis of cross-relaxation effects the spectral density functions have been evaluated using the motional parameters obtained from NQR data.