Abstract
Spin—lattice relaxation as a function of temperature has been studied for the salts (φ3AsCH3)+(TCNQ)2—, (φ3PCH3)+(TCNQ)2—, and (Cs+)2(TCNQ)3=. A plot of spin—lattice relaxation time (T1) as a function of the inverse of temperature yields a V-shaped curve for the above salts. Correlation times are calculated from the spin—lattice relaxation data and are shown to vary as the inverse of the exchange frequency. Such measurements furnish an independent means to calculate exchange frequencies. This represents the first case in which a minimum in T1 due to random modulation of the dipolar interaction has been observed in ESR, although such phenomena are common in NMR.
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