Potentiometric Studies on Complexation Equilibria between some Transition Metal Ions and 2-(Phenylhydrazono)butanoic Acid in Ethanol-Water Medium
| Main Authors: | E. KODANDA RAMAIAH, KASHI RAM |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1997
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5871129 |
Daftar Isi:
- Department of Chemistry, Osmania University, Hyderabad-500 007 Manuscript received 1 February 1994, revised 29 June 1995, accepted 28 July 1995 The binary (1 : 1, 1 : 2) and ternary (1 :1 : 1) metal complex formation constants or 2-(phynylhydrazono)butanoic acid (PHB) with bivalent Mn, Co, Ni, Cu and Zn Ions have been determined potentiometrically at 20, 30, 40 and 50o In 40, 50, 60 and 70 (v/v) ethanol-water mixtures at 0.10 M (KNO3) Ionic strength. The other chelating agents functioning as secondary ligands Include catechol, ethylenediamine, proline, hydroxyproline, β-alanine and glycine whie those acting as primary ones consist or 1,10-phenanlhroline and salicyUcacid. Thermodynamic parameten, differences In stability constants and percentages or distribution or various chelated species have been evaluated and discussed in terms or the basicity of ligands, statistical aspects, electrostatic Interaction, metal-ligand pi-interaction, denticity, nature or donor sites and stereochemical aspects.