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Title of Thesis

Ligand 1,2 Diimidazlo Ethane & Its Binding Effect on the Coordination Properties and Activity of Metals

Author(s)

Shah Parvez

Institute/University/Department Details
Department of Chemistry / University of Peshawar, Peshawar
Session
1997
Subject
Chemistry
Number of Pages
275
Keywords (Extracted from title, table of contents and abstract of thesis)
Ligand, Diimidazlo Ethane, Binding Effect, Coordination, Properties, Activity, Metals, Thermogravimetric

Abstract
1. Metal chelation is involved in many chemical, industrial and biological systems. The ligands 1,2- Diimidazoloethane (DIE) and 1,3-Diimidazolopropane (DIP), which can be viewed as N,N-substituted ethylenediamine and propylenediamine respectively, form tetrahedral metal complexes of the type [M(L)X] where M=Zn (II) , Cd (I I) , Hg (I I) Cu(II) and CC) (II) and X= Cl Br', I', NO,' and L DIE and DIP. The stearic requirements of the two ligands are similar. The physical measurements of all the complexes indicate that DIE and DIP act as bidentate ligands.
2. The chelation behaviour of these ligands in solution were studied and followed by the synthesis of their metal derivatives, which were characterized by the elemental analysis and infrared spectra. The metal contents in these complexes was assayed by atomic absorption technique and electron microprobe. The purity of these new compounds were further ascertained through melting point.
3. The solid state infrared spectra of these complexes generally support tetrahedral geometry (MN2X2) with coordination through pyrrole nitrogen atom. The effects of chelation on some characteristic bands were discussed and the solid state data are examined in the light of electronic spectra and conductance data of complexes in solution. The spectroscopic! and magnetic properties of these complexes were studied and compared.
4. Thermogravimetric analysis and differential thermal analysis have been employed simultaneously to investigate thermal stability, stoichiometry and mechanism of thermal decomposition of these complexes. The results provide information about complex fragmentation and transformation alongwith exothermic and endothermic changes. The similarities in thermal stabilities of DIE and DIP complexes indicate similar geometric coordination.
5. New quantitative procedures for the estimation of Bi(III), Hg(II) and Sb(III) based on their precipitation with DIE and DIP are reported.
6. In order to understand the comp-lexation behaviour of 1,2-Diimidazoloethane and 1,3-Diimidazolopropane with different transition metal cations e.g., Cu++, Zn++, Cd++, Hg++, Co++ and Ni++, their stoichiometric studies were carried out at different pH values using Job's method of continuous variation. The stability constants of these metal derivatives were also calculated by the same method.
7. The antibacterial and antifungal activity of these chelates were tested against strain of bacteria: Staphylococcus aureus and Aspergillus niger by cylinder plate diffusion method.

Download Full Thesis
14,449 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 CONTENTS

 

 
216 KB
2

1

INTRODUCTION 1
1,164 KB
3 2 INSTRUMENTAL TECHNIQUES 16
285 KB
4 3 EXPERIMENTAL 20
900 KB
5 4 RESULTS AND DISCUSSION 33
3,320 KB
6 5 THERMAL ANALYSIS 94
3,075 KB
7 6 ANALYTICAL USES OF 1,2-DIIMIDAZOLOETHANE AND 1,3-DIIMIDAZOLOPROPANE 155
982 KB
8 7 STABILITY OF COMPLEXES 177
2,452 KB
9 8 ANTIBACTERIAL, ANTIFUNGAL ACTIVITY OF DIE, DIP AND ITS METAL DERIVATIVES 229
360 KB
10 9 REFERENCES & APPENDICES 234
1,494 KB