G. Nemec et al., TIME-SCALE OF ELECTRONIC AND MOLECULAR MOTIONS IN THE CONDUCTING RADICAL-CATION SALT DIPERYLENE HEXAFLUOROPHOSPHATE, Synthetic metals, 95(2), 1998, pp. 149-153
Frequency and temperature dependence of nuclear spin lattice relaxatio
n is used fbr the derivation of motional time scales in the quasi-one
dimensional conductor diperylene hexafluorophosphate (incorporating te
trahydrofurane (THF) solvent molecules). Freezing in of reorientationa
l motion of the THF molecules at the stack-rotation phase transition T
-r approximate to 153 K is proved by the use of perdeuterated solvent.
Slowing down of hexafluorophosphate rotational motion is reflected by
F-19 and :H-1 relaxation in the 100 K range. The time constant descri
bing termination of the diffusive decay of the conduction-electron spi
n correlation is estimated from frequency-dependent proton spin relaxa
tion including rotating-frame data. (C) 1998 Elsevier Science S.A. All
rights reserved.