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Abstract:
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The current work deals with the synthesis and characterization of metal
complexes derived from some substituted acylhydrazones. The hydrazones under
investigation were characterized by IR, UV, NMR spectral studies and the
molecular structure of one of the hydrazones was solved by single crystal XRD
studies. In the present work dioxovanadium(V), manganese(II), cobalt(II/III),
nickel(II), copper(II), zinc(II) and cadmium(II) complexes were synthesized and
characterized by various spectroscopic techniques, molar conductance
measurements, magnetic susceptibility measurements and cyclic voltammetry.
Single crystals of some of the complexes were isolated and characterized by
single crystal X-ray diffraction.The thesis is divided into eight chapters. Chapter 1 gives an introduction
on hydrazones, diversity in their chelating behavior and their application in
various fields. This chapter also describes different analytical techniques
employed for the characterization of hydrazones and their metal complexes.
Chapter 2 includes the synthesis and characterization of two substituted
acylhydrazones. This chapter also discusses how the coordination behavior of
hydrazones under investigation is interesting. Chapters 3-8 discuss the synthesis
and characterization of some transition metal complexes derived from the
acylhydrazones under study.The hydrazones synthesized were found to exist in the amido form.
Various characterization techniques were carried out to explore the structure of
the synthesized complexes. The results indicate that both the hydrazones
coordinate through the pyridyl and azomethine nitrogens and amide oxygen either
in enolate or neutral form. Out of synthesized complexes V(V), Zn/Cd(II) and
one of the cobalt complex was found to diamagnetic. We could isolate single
crystals of some of the complexes and most of the complexes crystallized were
found to have a distorted octahedral geometry. Thus X-ray crystallographic study
which was used as major tool in the structure determination revealed that the
hydrazones undergo a rotation about the azomethine bond on complexation. We
hope the work presented in the thesis would be helpful for those who are working
in the field of metal complexes and can further they can be utilized for various
applications. |