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http://nopr.niscpr.res.in/handle/123456789/40267| Title: | Complex formation of cobalt(II) with 2-(imidazoleazo )benzene and 2-(2-aminoethyl)benzimidazole: A kinetic and equilibrium study |
| Authors: | Dash, Anadi C Acharya, Achyutananda Sahoo, Rama K |
| Issue Date: | Sep-1998 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The reversible complexation of cobalt(II) with 2-(irnidaioleazo) benzene (lAB) and 2-(2-aminoethyl)benzimidazole (AEB) has been studied at l=0.3 mol dm-3. At 25°C the values of log KM (KM is the stability constant), ∆H0/KJ mol-1, and ∆S0/JK-1 mol'! are 2.09±0.03, 14.4±2.4, 88±8 for Co(IAB)2+ and 2.65±0.01, 20.0±7.2, 120±21 for Co(AEB)2+ respectively. The rate constants of formation of COL2+chelate via the reaction: CO(OH2)62++L Co(OH2)4L2+., (10-4 k/dm-3 mol-1 s-1=11.7±0.4 (lAB), 1.01±0.03 (AEB) at 10°C) are at least 10 times smallerthan the rate constant of water exchange from Co(OH2)62+.Data analysis further indicates that the chelate formation involves Chelation Controlled Substitution mechanism. The dissociation of Co(AEB)2+ is strongly acid catalysed unlike that for Co(IAB)2+. |
| Page(s): | 759-764 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.37A(09) [September 1998] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 37A(9) 759-764.pdf | 565.92 kB | Adobe PDF | View/Open |
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