Accession Number : AD0660139

Title :   RATES OF EXCHANGE OF SOLVENT MOLECULES WITH PARAMAGNETIC IONS.

Descriptive Note : Final scientific rept.,

Corporate Author : MASSACHUSETTS UNIV AMHERST DEPT OF CHEMISTRY

Personal Author(s) : Stengle,Thomas R. ; Langford,Cooper H.

Report Date : 01 OCT 1967

Pagination or Media Count : 24

Abstract : A summary is given of a program aimed at the elucidation of the factors which determine the rate of solvent exchange (and ligand substitution) reactions with transition metal ions in solution. In many octahedral complexes it has become apparent that the reaction is mainly dissociative in nature, and that it is relatively independent of the entering group. Hence the composition of the second coordination sphere (solvation shell) plays an important role in the reaction rate. It was necessary to work out techniques for the determination of the composition of the solvation shell of a complex ion. Several methods of accomplishing this were developed; all of them depending on nuclear magnetic resonance measurements. Then exchange rates with metal ions and dimethylformamide were studied in depth. Some other systems were examined in less detail. There has resulted from the work a useful technique for the study of the kinetics and mechanisms of solvolysis reactions. (Author)

Descriptors :   (*COMPLEX COMPOUNDS, REACTION KINETICS), (*SOLVENTS, *EXCHANGE REACTIONS), TRANSITION METALS, NUCLEAR MAGNETIC RESONANCE, MOLECULAR ASSOCIATION, SUBSTITUTION REACTIONS, FORMAMIDES, NITRILES, NICKEL COMPOUNDS, CHROMIUM COMPOUNDS, COBALT COMPOUNDS

Subject Categories : Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE