Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim

A series of macrocyclic ligands of 6,13~diphenyl-1,8-dihydro-2,3:9,10-dibenzo- 1,4,8,11 -tetraazacyclotetradecane-4,6,11,13-tetraene (dptaaH2) and their methoxy, methyl, nitro, bromo, and chloro derivatives as well as their Co(ll), Ni(ll) and Cu(ll) complexes have been successfully synthesized. The...

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Main Author:	Kassim, Karimah
Format:	Thesis
Language:	English
Published:	2007
Subjects:	Schiff bases Crystallography
Online Access:	https://ir.uitm.edu.my/id/eprint/6137/3/6137.pdf
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spelling	my-uitm-ir.61372022-12-06T03:52:04Z Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim 2007 Kassim, Karimah Schiff bases Crystallography A series of macrocyclic ligands of 6,13~diphenyl-1,8-dihydro-2,3:9,10-dibenzo- 1,4,8,11 -tetraazacyclotetradecane-4,6,11,13-tetraene (dptaaH2) and their methoxy, methyl, nitro, bromo, and chloro derivatives as well as their Co(ll), Ni(ll) and Cu(ll) complexes have been successfully synthesized. The ligands and their complexes are characterized by elemental analysis (CHN), infrared, 1H and 13C liquid and solid-state NMR spectroscopies, magnetic susceptibility as well as X-ray crystallography. An x-ray investigation carried out on the macrocycle dptaahb suggests that the nitrogen atoms of the ligand are almost co-planar. A cyclic voltammetry study in dimethylsulfoxide (DMSO) shows redox potentials suggesting a irreversible electron transfer phenomenon for Co(dptaa), Co(N02dptaa) and Cu(Brdptaa). Tetradentate acyclic ligands and complexes of N,N-ethylenebis- (salicylideneimine), N,N-phenylenebis(salicylideneimine), bis(2-hydroxyacetophenone)ethylenediimine, bis(2-hydroxyacetophenone)phenylendiimine with Co(ll), Ni(ll), Cu(ll), Mn(ll), Sb(lll) and Bi(lll) complexes have been prepared. The bidentate chelate ligands of N,N'-bis(4-chlorobenzylidene)ethane-1,2- diamine), N,N'-bis(4-chlorophenylethylidene)ethane-1,2-diimine, N,N'-bis(4- methylbenzylidene)ethane-1,2-diimine with Co(ll) and Ni(ll) complexes are also prepared. The structures of the ligands and complexes are elucidated by elemental analysis (CHN), infrared,1H and 13C NMR, conductivity measurements, magnetic susceptibility as well as x-ray crystallography. The x-ray investigation of N,N'-bis(4-methylbenzylidene)ethane-1,2-diamine reveals that it is centrosymmetric about the central point of the ethylene bond and posseses E configuration across the azomethine (C=N) bond. The x-ray crystal structure for N,N'-bis(4-chlorobenzylidene)ethane-1,2-diamine is obtained to reveal that the crystal packing is stabilized by weak intermolecular hydrogen bonds, forming a three dimensional network. The macrocyclic and acyclic Schiff bases and their complexes are screened against E. coli, Pseudomonas sp., Streptococcus sp., Staphylococcus aureus and Salmonella typhi for antibacterial activity. From the results, it could be concluded that the complexes are better antibacterial agents than their respective free ligands. Attempts on synthesis of other Schiff base ligands and complexes derived from 1,8-napthalenediamine and 2-aminothiophenol are also reported. 2007 Thesis https://ir.uitm.edu.my/id/eprint/6137/ https://ir.uitm.edu.my/id/eprint/6137/3/6137.pdf text en public phd doctoral Universiti Teknologi MARA (UiTM) Faculty of Applied Sciences
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Schiff bases Crystallography
spellingShingle	Schiff bases Crystallography Kassim, Karimah Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim
description	A series of macrocyclic ligands of 6,13~diphenyl-1,8-dihydro-2,3:9,10-dibenzo- 1,4,8,11 -tetraazacyclotetradecane-4,6,11,13-tetraene (dptaaH2) and their methoxy, methyl, nitro, bromo, and chloro derivatives as well as their Co(ll), Ni(ll) and Cu(ll) complexes have been successfully synthesized. The ligands and their complexes are characterized by elemental analysis (CHN), infrared, 1H and 13C liquid and solid-state NMR spectroscopies, magnetic susceptibility as well as X-ray crystallography. An x-ray investigation carried out on the macrocycle dptaahb suggests that the nitrogen atoms of the ligand are almost co-planar. A cyclic voltammetry study in dimethylsulfoxide (DMSO) shows redox potentials suggesting a irreversible electron transfer phenomenon for Co(dptaa), Co(N02dptaa) and Cu(Brdptaa). Tetradentate acyclic ligands and complexes of N,N-ethylenebis- (salicylideneimine), N,N-phenylenebis(salicylideneimine), bis(2-hydroxyacetophenone)ethylenediimine, bis(2-hydroxyacetophenone)phenylendiimine with Co(ll), Ni(ll), Cu(ll), Mn(ll), Sb(lll) and Bi(lll) complexes have been prepared. The bidentate chelate ligands of N,N'-bis(4-chlorobenzylidene)ethane-1,2- diamine), N,N'-bis(4-chlorophenylethylidene)ethane-1,2-diimine, N,N'-bis(4- methylbenzylidene)ethane-1,2-diimine with Co(ll) and Ni(ll) complexes are also prepared. The structures of the ligands and complexes are elucidated by elemental analysis (CHN), infrared,1H and 13C NMR, conductivity measurements, magnetic susceptibility as well as x-ray crystallography. The x-ray investigation of N,N'-bis(4-methylbenzylidene)ethane-1,2-diamine reveals that it is centrosymmetric about the central point of the ethylene bond and posseses E configuration across the azomethine (C=N) bond. The x-ray crystal structure for N,N'-bis(4-chlorobenzylidene)ethane-1,2-diamine is obtained to reveal that the crystal packing is stabilized by weak intermolecular hydrogen bonds, forming a three dimensional network. The macrocyclic and acyclic Schiff bases and their complexes are screened against E. coli, Pseudomonas sp., Streptococcus sp., Staphylococcus aureus and Salmonella typhi for antibacterial activity. From the results, it could be concluded that the complexes are better antibacterial agents than their respective free ligands. Attempts on synthesis of other Schiff base ligands and complexes derived from 1,8-napthalenediamine and 2-aminothiophenol are also reported.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Kassim, Karimah
author_facet	Kassim, Karimah
author_sort	Kassim, Karimah
title	Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim
title_short	Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim
title_full	Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim
title_fullStr	Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim
title_full_unstemmed	Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim
title_sort	synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / karimah kassim
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Applied Sciences
publishDate	2007
url	https://ir.uitm.edu.my/id/eprint/6137/3/6137.pdf
_version_	1783733138598395904

Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim

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