Accession Number : AD0704162

Title :   MAGNETIC RESONANCE MEASUREMENTS OF PROTON EXCHANGE IN AQUEOUS UREA.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF CHEMISTRY

Personal Author(s) : Vold,R. L. ; Daniel,E. S. ; Chan,S. O.

Report Date : 02 MAR 1970

Pagination or Media Count : 29

Abstract : Rates of protolysis of aqueous urea were measured by steady state and spin echo NMR methods, with good agreement between the two techniques. Below about two molar urea, the lifetime of a proton on urea is independent of urea concentration. Protonation occurs at urea nitrogen rather than oxygen. Above about two or three molar urea, formation of aggregated species of urea causes the lifetime of a urea proton to depend on urea concentration. (Author)

Descriptors :   (*UREA, *EXCHANGE REACTIONS), (*NUCLEAR MAGNETIC RESONANCE, EXCHANGE REACTIONS), PROTONS, SOLUTIONS(MIXTURES)

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE