Abstract:
This doctoral thesis is devoted to the study of azo dyes and their organometallic
complexes, which are a particular class of chemistry whose importance and interest to
remain our considerable days. The dye industry is nowadays a permanent investigative
sector that continues to grow.
The content of this thesis presents a contribution to the study of some coloring
substances containing the chromophore azo -N = N- and their organometallic complexes
subdivided as follows:
A general introduction, to position the interest of the subject, followed by a first
chapter a bibliographic overview of dyes, azo dye compounds and their metal
complexes history, generalities, application then we presented the various techniques
experimental used.
The second chapter deals with the synthesis of a series of azo dyes followed by an
analytical study of characteristic structures obtained by conventional spectroscopic
methods: IR, 13C NMR, 1H NMR, UV-Visible, elemental microanalysis and a structural
resolution and crystal X-ray diffraction study of new synthesized compounds.
The third chapter is devoted to the synthesis of a series of new organometallic
complexes using the new chromogenic azo compounds synthesized as ligands with
different metals as: Cu(II), Pd(II), Ni(II), followed by an analytical study of
characteristic structures obtained by conventional spectroscopic methods: IR, 13C NMR,
1H NMR, UV-Visible, elemental microanalysis and a structural resolution and crystal
X-ray diffraction study of new synthesized complexes.
The synthesized ligands are usually based on the skeleton of the azobenzene, they
are aromatic or pseudo-aromatic systems linked by an azoic group (-N = N-). They are
obtained by treating primary aromatic amines with nitrous acid, in a reaction known
diazotization followed by diazo-coupling, these azo compounds obtained underwent
complexation reaction with different metals: Cu(II), Pd(II), Ni(II) to yield
organometallic complexes or metal-dyeing dyes.
