| dc.contributor.author |
Oyetunji, O.A. |
|
| dc.contributor.author |
Paphane, B.D. |
|
| dc.contributor.author |
Becker, C.A.L. |
|
| dc.date.accessioned |
2012-11-06T07:16:31Z |
|
| dc.date.available |
2012-11-06T07:16:31Z |
|
| dc.date.issued |
2006 |
|
| dc.identifier.citation |
Oyetunji, O.A. et al. (2006) Kinetic studies on the reactions of some tetrakis(arylisocyanide)cobalt(II) complexes with pyridine in 2,2,2-trifluoroethanol, Transition Metal Chemistry, Vol. 31, No. 7, pp. 951–957 |
en_US |
| dc.identifier.issn |
0340-4285 (Print) |
|
| dc.identifier.issn |
1572-901X (Online) |
|
| dc.identifier.uri |
http://hdl.handle.net/10311/1033 |
|
| dc.description.abstract |
The interaction of pyridine with four tetraki(arylisocyanide)cobalt(II) complexes, [Co(CNR)4(ClO4)2] R = 2,6-
Me2C6H3 (A), 2,4,6-Me3C6H2 (B), 2,6-Et2C6H3 (C) and 2,6-iPr2C6H3 (D), have been studied in 2,2,2-trifluoroethanol
medium. The kinetics of the reactions were investigated over the 293–318 K temperature range. The reaction profile exhibited two distinct processes, proposed to be an initial fast substitution followed by a slow
reduction, for each of the reactions. The pseudo first-order rate constants for both processes increased with increasing concentration of pyridine with the reduction processes exhibiting saturation kinetics at high pyridine
concentrations. Steric hindrance plays a significant role in the rates of the reactions, as the rates decrease in the
order k(A) > k(B) > k(C) > k(D). The activation enthalpies, DH , increase from A to D while the activation
entropies, DS , are relatively similar for the four reactions, indicating similar transition states and hence similar
mechanisms. Complex B was first synthesized and characterized in this study. |
en_US |
| dc.language.iso |
en |
en_US |
| dc.publisher |
Springer, http://www.springer.com/chemistry/journal/11243 |
en_US |
| dc.subject |
Pyridine |
en_US |
| dc.subject |
Tetrakis(arylisocyanide) |
en_US |
| dc.subject |
Cobalt(II) complexes |
en_US |
| dc.subject |
Kinetics |
en_US |
| dc.title |
Kinetic studies on the reactions of some tetrakis(arylisocyanide)cobalt(II) complexes with pyridine in 2,2,2-trifluoroethanol |
en_US |
| dc.type |
Published Article |
en_US |
| dc.link |
http://www.springerlink.com/content/p5745j3864054567/fulltext.pdf |
en_US |