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http://nopr.niscpr.res.in/handle/123456789/20097| Title: | Substitution on [(H2O)(tap)2RuORu(tap)2(H2O)]2+ ion with inosine at physiological pH in aqueous medium |
| Authors: | Chattopadhyay, Hriday Ghosh, Alak Kumar |
| Issue Date: | Mar-2005 |
| Publisher: | NISCAIR-CSIR, India |
| IPC Code: | Int. Cl.7 C07F15/00 |
| Abstract: | The interaction of inosine with the title complex has been studied spectrophotometrically in aqueous medium as a function of [substrate complex], [ligand], pH and temperature at constant ionic strength. At physiological pH (7.4) the interaction with inosine shows two distinct consecutive steps; both the processes are [ligand] dependent. An associative interchange mechanism is proposed; the activation parameters calculated from Eyring plots are: ΔH1# = 12.5 ± 1.1 kJ mol-1, ΔS1# = -259 ± 3 JK-1 mol-1, ΔH2#= 28.9 ± 1.1 kJ mol-1 and ΔS2#= -230 ± 3 JK-1 mol-1 . From temperature dependence of the outer sphere association complex formation equilibrium constant, the thermodynamic parameters calculated are: ΔH1° = 12. 1 ± 1.0 kJ mol-1, ΔS1° = 100 ± 3 JK-1 mol-1 and ΔH2° = 7.6 ± 0.3 kJ mol-1, ΔS2° = 70 ±1 JK-1 mol-1, which gives a negative ΔG° at all temperatures studied, supporting the spontaneous formation of an outer sphere association complex. |
| Page(s): | 483-489 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.44A(03) [March 2005] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 44A(3) 483-489.pdf | 1.43 MB | Adobe PDF | View/Open |
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