Kinetic and mechanistic study of the mercury(II)-catalyzed substitution of cyanide in hexacyanoruthenate(II) by pyrazine |
| |
Authors: | Radhey M Naik Amit K Verma Abhinav Agarwal Abhas Asthana |
| |
Institution: | (1) Department of Chemistry, University of Lucknow, Lucknow, 226007, India |
| |
Abstract: | The kinetics of mercury(II)-catalyzed substitution of cyanide ligand in hexacyanoruthenate(II) by pyrazine (Pz) has been investigated
spectrophotometrically at 370 nm in aqueous medium. The reaction exhibits first-order dependence on Pz] at low concentrations,
then reaches a maximum value, and finally decreases at high Pz]. The reaction has a variable-order dependence in Ru(CN)6
4−], unity at lower Ru(CN)6
4−], and fractional order, not tending to zero order at higher Ru(CN)6
4−]. The effects of pH, ionic strength, concentration of catalyst, and temperature variations have been studied. The activation
parameters for the reaction were calculated. We propose a solvent assisted interchange dissociative (I
d) mechanism for the reaction. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|