35Cl NOR and 19F NMR relaxation studies of CClF2 group dynamics in N(CH3)4H(ClF2CCOO)2.
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.
Zdanowska-Fraczek
M
M
Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland.
Medycki
W
W
D000085:Acetates / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry; D003460:Crystallization; D005461:Fluorine / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013816:Thermodynamics
D000085:Acetates; D000644:Quaternary Ammonium Compounds; D005461:Fluorine; D002713:Chlorine; C072794:chlorodifluoroacetic acid; C027917:tetramethylammonium