|
| << previous | next >> |
Journal description
All volumes of the corresponding journal
All issues of the corresponding volume
All articles of the corresponding issues
Details for article 30 of 73 found articles
| Title: |
LIGAND EXCHANGE REACTIONS. THE KINETICS OF THE REACTION OF [14]aneN4, [15]aneN4 AND [16]aneN4 WITH COPPER(II) GLYCYLGLYCINATE |
| Author: |
Hay, Robert W. Hassan, Mansour M. |
| Appeared in: |
Journal of coordination chemistry |
| Paging: | Volume 37 (1996) nr. 1-4 pages 271-281 |
| Year: |
1996-02-01 |
| Contents: |
The kinetics of the reaction of the 14-, 15- and 16-membered tetra-aza macrocycles (1-3) with Cu(II)-glycylglycinate have been studied at 25°C by stopped-flow techniques. A biphasic reaction was observed in all the reactions at δmax for the Cu(II) macrocycle (470-550 nm). The initial fast step is associated with an absorbance decrease and the slower reaction to an absorbance increase. The latter reaction is assigned to the metal exchange step and is first order in both the total ligand and Cu(II)-glycylglycinate concentrations. All kinetic measurements were carried out under pseudo first-order conditions in the pH range 7.5 to 9.0 with Cu(II)-glycylglycinate in at least a ten-fold excess. Specific rate constants have been obtained for the reactions [image omitted] where HL+ is the monoprotonated form of the tetra-aza macrocycle and G2 is the anion of glyclyglycine. Thus for the reaction with [14]aneN4, k1 = 3.0 × 103 dm3 mol-1s-1 and k2 = 1.3 × 105 dm3 mol-1s-1 at 25°C and I = 0.15 mol dm-3 (NaCl). The mechanism of the reaction is discussed in detail. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 30 of 73 found articles
| << previous | next >> |
Toegankelijkheidsverklaring