SUMMARY The thesis deals with the synthesis, characterization and catalytic activity studies of some new transition metal complexes of Schiffubases derived from quinoxalintrz-carboxaldehyde. The thesis is divided into eight chapters. Chapter I of ‘the thesis presents an introduction to metal complexes of Schiff bases derived from various aldehydes, like salicylaldehyde, pyridine-2-carboxaldehycle and quinoxaline-2-carboxaldehyde. The scope of the present investigation is also outlined in this chapter. Chapter 11 gives the procedures for the synthesis of Schiff base ligands and the experimental procedures involved in the study. Chapters III, IV, V and VI deal with the studies on the synthesis and characterisation of complexes of the Schiff base ligands obtained by the interaction of quinoxaline-2-carboxaldehyde with 2-aminophenol, semicarbazide, o-phenylene diamine or furfurylamine. The results of our studies on the manganese(II). iron(III), cobalt(II). nickel(]I) and copper(II) complexes of the Schiff base, quinoxaline—2-carboxaJidene—2-aminophenol (QAP) are presented in ChapterIlI. All the complexes are non-electrolytes in nitrobenzene. The complexes have the general formula [M(QAP)2l, where H =
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The thesis is divided into eight chapters. Chapter I of ‘theshodhganga.inflibnet.ac.in/bitstream/10603/19153/13/13_summary.pdf · bidentate ligand coordinating through the azomethine
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SUMMARY
The thesis deals with the synthesis, characterization andcatalytic activity studies of some new transition metal complexes of
Schiffubases derived from quinoxalintrz-carboxaldehyde.
The thesis is divided into eight chapters. Chapter I of ‘thethesis presents an introduction to metal complexes of Schiff bases
derived from various aldehydes, like salicylaldehyde,pyridine-2-carboxaldehycle and quinoxaline-2-carboxaldehyde. The scope
of the present investigation is also outlined in this chapter. Chapter
11 gives the procedures for the synthesis of Schiff base ligands and the
experimental procedures involved in the study.
Chapters III, IV, V and VI deal with the studies on the synthesis
and characterisation of complexes of the Schiff base ligands obtained by
the interaction of quinoxaline-2-carboxaldehyde with 2-aminophenol,
semicarbazide, o-phenylene diamine or furfurylamine. The results of our
studies on the manganese(II). iron(III), cobalt(II). nickel(]I) and
copper(II) complexes of the Schiff base,quinoxaline—2-carboxaJidene—2-aminophenol (QAP) are presented in
ChapterIlI. All the complexes are non-electrolytes in nitrobenzene.
The complexes have the general formula [M(QAP)2l, where H =
(ii)
manganese(II). cobalt(1'I), nickel(]I) or copper(II). The formula of the
iron(1Il) complex is [Fe(QAP)2Cl2l. The IR spectral studies of thecomplexes indicate that the Schiff base binds to the metal through the
nitrogen atom of the azomethine group and through the hydroxyl oxygen
atom, the latter is coordinated to the metal atom in the ionised form.
Magnetic and electronic spectral data suggest a tetrahedral structure
for the manganese(II), cobalt(II) and nickel(II) complexes, a distorted
tetrahedral structure for the copper(]I) complex and an octahedral
dimeric structure with bridging chlorine atom for the iron(Il1) ‘complex
respectively.
Chapter IV deals with the synthesis and characterisation of
manganese(II), iron(I[I), cobalt(II), nickel(II) and copper(II)complexes of the Schiff base, quinoxaline-2-caboxaldehyde semicarbazone
(QSC). The complexes are non—electrolytes in nitrobenzene. With the
exception of the iron(II[) complexes, all the complexs have the general
formula [H(QSC)Cl2l. The formula of the iron(II[) complex is[Fe(QSC)Cl3]. IR spectral studies of these complexes show that in thecase of the iron(1II) complex QSC acts as a tridentate ligand,coordinating through the azomethine nitrogen atom, the ring nitrogen
atom and the carbonyl oxygen atom where as in all the other complexes
binding through the carbonyl oxygen atom is absent and it acts as a
bidentate ligand. Magnetic and electronic spectral data of the
(iii)
complexes reveal a tetrahedral structure for the manganese(1'I),cobalt(H) and nickel(II) complexes. an octahedral structure for the
iron(IH) complex and a square planar structure for the copper(II)
complex. EPR spectrum of the copper(II) complex is similar to that of
other. reported cases of square planar copper(1I) Complexes.
Chapter V gives details about our studies on the manganese(II),
iron(lI[). cobalt(II), nickel(II) and copper(II) complexes of the Schiff