?DETtRMINATION OF THERMODYNAMIC PARAMETtRS FOR THE DECOMPOSITION OF SOME METAL CHELATES OF SUBSTITUTED HYDRAZOPYRAZOLONES

Authors

  • LAlLA I. ALi Chemistry Department, Faculty of Education, Ain Shams University, Ileliopolis, Cairo, Egypt
  • SHAKER L. STEFAN Chemistry Department, Faculty of Education, Ain Shams University, Ileliopolis, Cairo, Egypt

Keywords:

Thermodynamic parameters, Metal chelates, Hydrazopyrazolones.

Abstract

The relative thermodynamic parameters of aseries of metal derivatives ofhydrazopyrazolone dyes containing meta
-OH, -COOH, and -OCH3 groups have been determined by TGA, DTG and differential thermal analysis (DTA). The
effects of substitutent on the hydrazo-rnoicty of the ligand on the stability of the complexes arc discussed. The affinity of different ligands for complexation with metal ions MO+[M=U022., Fe3., Cu2• and I-Ig' 1reaches its highest value with metahydroxyphenylhydrazopyrazolone. The relative order of thermal stability is : UO/+ > Fe3+> Cu2+> Hg2+.The data
were correlated and the results were used to explain the stabilization of such chclatcs by dative 1t-bonding between MDt
and the ligand.

Published

2022-06-09

How to Cite

ALi , L. I. . . ., & STEFAN , . . . S. L. . (2022). ?DETtRMINATION OF THERMODYNAMIC PARAMETtRS FOR THE DECOMPOSITION OF SOME METAL CHELATES OF SUBSTITUTED HYDRAZOPYRAZOLONES . Biological Sciences - PJSIR, 37(6-7), 235–240. Retrieved from https://v2.pjsir.org/index.php/biological-sciences/article/view/2673

Issue

Vol. 37 No. 6-7 (1994): Pakistan Journal of Scientific and Industrial Research

Section

Articles