4.4 Author:
   Finter, C. K.; Hertz, H. G.
Reference:
   Journal, ZPCFAX, Z.Phys.Chem.(Munich), EN, 148, 1986, 75-96
Title:
   NMR Relaxation Study of I- and Na+ Solvation Structure in Formamide (FA) and Preferential Solvation of these Ions in the Mixture FA/H2O
Abstract:
Proton magnetic relaxation rates of HCOND2 and DCONH2 caused by magnetic dipole-dipole interaction with 127I and 23Na in the ions I- and Na+, respectively, have been measured.These results were obtained by the isotopic H/D substitution technique with extrapolation to the limit proton content -> O.From these data closest distances of approach between the interacting nuclei were derived which then, with the geometry of the FA molecule, yielded the ion-solvent configuration in the solvation sphere.The corresponding measurements for the formyl protons were performed in FA/water mixtures over the whole composition range.The approximate degree of preferential solvation or preferential hydration could be derived from these measurements.