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
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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 https://ir.uitm.edu.my/id/eprint/6137/ Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim 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 NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/6137/3/6137.pdf Synthesis and characterization of new macrocyclic and acyclic schiff base ligands and metal complexes / Karimah Kassim. (2007) PhD thesis, thesis, Universiti Teknologi MARA (UiTM). <http://terminalib.uitm.edu.my/6137.pdf>
institution Universiti Teknologi Mara
building Tun Abdul Razak Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Mara
content_source UiTM Institutional Repository
url_provider http://ir.uitm.edu.my/
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
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
publishDate 2007
url https://ir.uitm.edu.my/id/eprint/6137/3/6137.pdf
https://ir.uitm.edu.my/id/eprint/6137/
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