Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title NMR and Calorimetric Study of the Interactions between Lanthanide Ions and Water.
Author Birnbau, Edward R. ;
CORP Author New Mexico State Univ., University Park. Water Resources Research Inst.
Year Published 1971
Report Number OWRR-A-023-NMEX; 12695,; A-023-NMEX(1)
Stock Number PB-202 856
Additional Subjects ( Rare earth compounds ; Hydration) ; ( Nuclear magnetic resonance ; Hydration) ; Organic solvents ; Acetonitrile ; Chemical bonds ; Ions ; Complex compounds ; Chemical shifts(Nuclear magnetic resonance)
Library Call Number Additional Info Location Last
NTIS  PB-202 856 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 4p
The interaction of lanthanide ions with water in acetonitrile has been studied. The measured enthalpy is surprisingly small (greater than minus 2.0 kcal/mole) precluding calculation of thermodynamic parameters. The isotropic proton shift measured for the praseodymium(III) and neodymium(III) water complexes at ligand to metal ion mole ratios greater than 50 have the opposite sign from the isotropic shift measured in pure water. The absence of strong hydrogen-bonding of the solvent and second coordination sphere to the first coordination sphere in acetonitrile is proposed as an explanation for the change in sign. The pattern of the proton isotropic shifts in acetonitrile closely resemble the O17 isotropic shifts measured for water solutions of lanthanide ions. The similarity suggests that both these shifts result from a contact interaction whereas the proton shifts in water are dominated by a pseudo-contact interaction. (Author)