Accession Number : AD0852718

Title :   Exchange Rate of Ions Containing Bromine and Iodine in an Aqueous Solution from the Line Width of Nuclear Magnetic Resonance,

Corporate Author : GENERAL DYNAMICS/ASTRONAUTICS SAN DIEGO CA

Personal Author(s) : Hertz, H. G.

Report Date : JUN 1962

Pagination or Media Count : 49

Abstract : In an aqueous solution the velocity constants for very rapid reversible reactions of the type MeX(i-1) + X = MeXi(-) are determined from the line width of the magnetic nuclear resonances of 81Br, 79Br and 127I. The tested substances are as follows: CdBr2, HgBr2, ZnBr2, CdI2 and ZnI2, which, when in solution, form ions or neutral molecules of the type Me(++), MeX(+), MeX2, MeX3(-) and MeX4(-2). The cited results of measurements show that by adding small amounts of the substance to a fully dissociated electrolyte (KBr,KI) the nuclear resonant lines of Br and I will broaden considerably. The equation for calculating the rate constant can be deduced from the measured broadening of the line. This is followed by a numerical evaluation of the rate constant for each of the five examined cases and by a discussion of the necessary equilibrium constants and activity coefficient. In addition, some numerical values, from measurements are given for the transverse relaxation time T2 of 881Br and 79Br for the various ions.

Descriptors :   *NUCLEAR MAGNETIC RESONANCE), (*EXCHANGE REACTIONS, REACTION KINETICS, LINE SPECTRA, BROMIDES, IODIDES, CADMIUM COMPOUNDS, MERCURY COMPOUNDS, ZINC COMPOUNDS, ISOTOPES, WEST GERMANY.

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE