Spectrophotometric and Polarographic Studies on the Kinetics of Hydrolysis of N‐(6‐Methyl‐5‐Nitropyridin‐2‐yl Methylidene)‐N′‐(Substituted Thiazol‐2‐yl)Hydrazines

Abstract

The kinetics of the hydrolysis of hydrazone de rived from nitropyridine 2‐carboxaldehyde and 2‐hydrazino‐4‐substituted thiazoles Ia‐e in 10% (v/v) DMF‐buffer mixture has been investigated by applying two in dependent and different techniques viz UV‐spectrophotometry and differential pulse, polarography (DPP). The hydrolysis has been found to follow general acid‐base catalysis. Mechanism for the hydrolysis in acidic medium has been postulated. The observed rate constants, activation and thermodynamic parameters for the hydrolysis have been calculated. The effects of pH, molecular structure, temperature and change in percent age of water in the DMF‐buffer mixture on the rate of hydrolysis have been discussed.

Determination of Sulfide in Spring and Wastewater by a New Kinetic Spectrophotometric Method

“…Kinetic methods have been widely used in catalytic and non catalytic determination of various chemical species; [16][17][18][19][20][21][22][23][24][25][26] the different techniques and procedures associated with this type of method have been reviewed. 27,28 Kinetic methods determinations of micro amounts of sulfide have been de-scribed.…”