S. Bradl et Ew. Lang, HYDRATION WATER DYNAMICS IN UNDERCOOLED AQUEOUS-SOLUTIONS OF HYDROPHOBIC IONS, Journal of physical chemistry, 97(40), 1993, pp. 10463-10471
Deuterium spin-lattice relaxation times (H-2 T1) are reported for the
first time as a function of temperature (180-300 K), pressure (p less-
than-or-equal-to 225 MPa), and composition (c less-than-or-equal-to 5
m) in undercooled aqueous solutions of tetraalkylammonium ions (R4N+).
A comparison with related investigations of undercooled alkali-metal
halide solutions allows the competing influence of coulombic, hydropho
bic, and H-bond interactions upon the dynamic structure of the random,
transient H-bond network to be studied. Solvent dynamics are seen to
be closely related to the glass-forming tendency of undercooled tetram
ethylammonium (Me4N+) and tetrapropylammonium (Pr4N+) bromide solution
s and to the clathrate-forming tendency of undercooled tetrabutylammon
ium (Bu4N+) bromide solutions.