• Dr Anupma Singh
• Prof, R.M. Naik

This study investigates the kinetics and mechanism of the Ag(I)-catalyzed substitution of coordinated cyanide in hexacyanoferrate(II) by dipyrido [3,2-d ∶ 2′,3′-f] quinoxaline (Dpq), monitored spectrophotometrically via the formation of the dark green complex [Fe(CN)₅bpy]³⁻ at 547 nm. Experimental conditions were maintained at 25 ± 0.1°C and pH 2.5 ± 0.02. The reaction rate was examined as a function of pH, [Fe(CN)₆]⁴⁻, and [dpq], revealing variable order dependence on the ferricyanide concentration. Effects of dielectric constant, solvent composition, temperature, and ionic strength were analyzed to suggest a polar transition state and an interchange dissociative (Id) mechanism. The catalytic behaviour of Ag⁺ across various concentrations was also explored. Activation parameters were derived using Arrhenius and Eyring equations to support the proposed mechanistic pathway.

Dpq, Kinetics, hexacyanoferrate, dissociative, silver catalysed.

"KINETICS OF SILVER CATALYZED LIGAND EXCHANGE REACTION BETWEEN HEXACYANOFERRATE (II) AND DPQ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 7, page no.d62-d73, July-2025, Available :http://www.jetir.org/papers/JETIR2507309.pdf

"KINETICS OF SILVER CATALYZED LIGAND EXCHANGE REACTION BETWEEN HEXACYANOFERRATE (II) AND DPQ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 7, page no. ppd62-d73, July-2025, Available at : http://www.jetir.org/papers/JETIR2507309.pdf