title: NMR study of lithium ion in nitrobenzene/water system.
abstract: The goal of this project has been to elucidate the solvation states and kinetics involved in the transfer of Li ions between nitrobenzene and water. A large interface area has been realized by confining one phase in polymer beads and suspending them in the other phase. A 2D 7Li-NMR spectroscopic result of such a system obtained on a 400 MHz instrument has shown that the rate of the Li ion transfer exchange between nitrobenzene and water is too fast to resolve individual solvatomers. A pair of well-resolved 7Li-NMR peaks corresponding to different solvation environments of Li+ in "wet" nitrobenzene has been observed. The most surprising result is that the ratio of those two peaks and their separation changes over a period of days, but it can be reversibly changed by mechanical disturbance, such as ultrasonication. This effect is reproducible and suggests spontaneous but slow formation of metastable solvatomers of Li+. Another surprising observation has been slow and irreversible incorporation of lithium ion from wet nitrobenzene into the walls of the silica-containing vessels.
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA.
authors.forename: Greg
authors.initials: G
authors.lastname: Moakes
authors.forename: Leslie T
authors.initials: LT
authors.lastname: Gelbaum
authors.forename: Johannes
authors.initials: J
authors.lastname: Leisen
authors.forename: Jiri
authors.initials: J
authors.lastname: Janata