Accession Number:

ADA247896

Title:

The Trans-Cis Isomerisation of Bis(dioxolene)bis(pyridine)Ruthenium Complexes

Descriptive Note:

Technical rept. no. 43, Jun-May 1992

Corporate Author:

YORK UNIV TORONTO (ONTARIO) DEPT OF CHEMISTRY

Personal Author(s):

• Tse, Yu-Hong
• Auburn, Pamela R.
• Lever, A. B.

Report Date:

1992-03-03

Pagination or Media Count:

29.0

Abstract:

The isomerization of trans to cis bis3,5-di-t-butylbenzo semiquinonato bisR-Pyridine ruthenium, RuR-Py2DTBDiox2, is induced by warming with an excess of R-pyridine, where R 3-chloro, 4-methyl, 4-phenyl or 4-butyl. The rates of these reactions, for the species with R-Py 3- chloropyridine, were monitored in o-dichlorobenzene by uv-visible spectroscopy, against varying 3-chloropyridine and varying trans-Ru3-ClPy2DTBDiox2 concentration. The data were found to obey first order kinetics. A plot of 1 kobsd vs. 3-chloropyridine is linear with a positive intercept. A dissociative mechanism is proposed for the isomerisation reaction. The activation parameters were determined for the specific case of R-Py 3-chloropyridine. Electronic and electrochemical features of these species are briefly discussed.

Descriptors:

• *KINETICS
• ELECTRONICS
• ACTIVATION
• PARAMETERS
• DISSOCIATION
• ISOMERIZATION
• INTERCEPTION
• ELECTROCHEMISTRY
• HEATING

Subject Categories:

• Polymer Chemistry
• Metallurgy and Metallography
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE