Lp. Chen et al., The T, p-dependence of the chemical shift of the hydroxyl protons in deeply supercooled methanol and water, Z NATURFO A, 55(3-4), 2000, pp. 473-477
Citations number
22
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
The hydroxyl proton chemical shifts delta ((H) under bar - O) of supercoole
d methanol (T-min = 149 K) and water have been determined (T-min = 183 K),
and the pressure dependence of these shifts was measured up to 200 MPa. In
both compounds the downfield shift of delta ((H) under bar - O) continues d
own to the lowest temperatures reached. This result disagrees with the two
state models for the hydrogen bond formation in both liquids. The isotherms
delta ((H) under bar(2)O) show for T less than or equal to 273 K an upfiel
d shift that becomes more pronounced with decreasing temperature. For delta
((H) under bar - O - CH3), increasing p causes at all temperatures a downs
hift.