NMR determination of dynamic parameters of CH3 groups in P(CH3)4SbCl6.


The longitudinal relaxation time T1 and the second moment M2 of 1H NMR line in a wide temperature range have been measured for P(CH3)4SbCl6. It was found that two different methyl groups in each tetramethylphosphonium cation perform two different rates of C3 motions. The reduction of the proton second moment M2 just below the temperature of the phase transition Tc2 = 350 K may suggest that the isotropic tumbling of the whole cation [P(CH3)4]+ is involved in the structural change of the crystal lattice induced by the movements of the [SbCl6]- anion.


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