Molecular dynamics in ferroelectric 4-aminopyridinium tetrachloroantimonate(III), [4-NH2C5H4NH][SbCl4].
Proton spin-lattice relaxation time and second moment of polycrystalline [4-NH2C5H4NH][SbCl4] have been determined at 160-400 K, at 90 and 25 MHz. The temperature dependence of the second moment indicates that the cation is in the "frozen" state over that temperature range, while at higher temperatures it oscillates at an angle of 135 degrees to the pseudo-six-fold axis of the aromatic ring. Weak influence of different phase transitions on the temperature dependences of relaxation times T1 and T1D can be explained in terms of molecular dynamics.
Medycki
W
W
Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznan, Poland. wom@ifmpan.poznan.pl
Holderna-Natkaniec
K
K
Swiergiel
J
J
Jakubas
R
R