ISSN:
1572-8927
Keywords:
Dimethylsulfoxide
;
thallium acetate
;
trifluoroethanol
;
Tl-205 NMR chemical shifts
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The association of thallium acetate ion in 2,2,2-trifluoroethanol and dimethyl-sulfoxide has been investigated by thallium-205 NMR spectroscopy. Analysis of the association constants as a function of temperature indicates that in trifluoroethanol the association enthalpy and entropy are, respectively, 1.6 kcal-mol−1 and 19.3 cal-mol−1-K−1 and in dimethylsulfoxide they are-0.99 kcal-mol−1 and 18.0 cal-mol−1-K−1. Examination of the temperature dependence of the chemical shift of the ion-pair reveals that in dimethylsulfoxide the ion-pair exists as a contact species, while in trifluoroethanol the solvent-separated ion-pair is more likely.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00649036
Permalink
