| Autor: |
Miss) Nishi Gupta, P.C. Nigam, R.M. Naik |
| Rok vydání: |
1989 |
| Předmět: |
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| Zdroj: |
Inorganica Chimica Acta. 160:103-110 |
| ISSN: |
0020-1693 |
| DOI: |
10.1016/s0020-1693(00)85408-0 |
| Popis: |
The reaction of [PdPar(OH)] − with cyanide ion has been followed at 510 nm (λ max of [PdPar(OH)] − ) while the reaction of [Cd(Par) 2 ] 2− with cyanide ions has been followed at 495 nm (λ max of [Cd(Par)] or [Cd(Par) 2 ]) by the stopped flow technique at pH= 11.0 ± 0.02, I =0.1 M (NaClO 4 ) and temperature= 25 ± 0.1 °C under pseudo-first-order conditions taking cyanide in large excess. The reaction between [PdPar(OH)] − and cyanide ion follows first-order kinetics in both [CN − ] and [PdPar(OH)] − . The reactions of [Cd(Par)] and [Cd(Par) 2 ] with cyanide ions also follow first-order kinetics in each reactant at higher cyanide concentrations. The reactions of [PdPar(OH)] and [Cd(Par) 2 ] with cyanide ions exhibit zero-order dependences in [CN − ] at extremely low cyanide concentrations. The reverse reaction between [Pd(CN) 4 ] 2− and Par, and [Cd(CN) 4 ] 2− and Par follow first-order kinetics in each reactant and an inverse first-order dependence in cyanide ion. It is inferred that the fourth step is the rate determining one in a proposed five step mechanistic scheme. Additional studies viz. effect of ionic strength, pH dependence and temperature dependence were also conducted and support the proposed mechanistic scheme. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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