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Abstract
Anil compounds are Schiff bases derived from aniline moiety containing phenyl or substituted phenyl group, which sometimes called Azo dyes. These Schiff bases can be directly prepared from aromatic amine with aromatic carbonyl groups, which are stable and can be manipulated under different and suitable conditions. The phenomena of coordination of Schiff bases with metal ions give the Schiff bases the good advantages to be introduced in the dyes synthesis. The classification of dyes is based on the chemical structure or on the basis of the chromophoric system. The metal complex dyes are combinations of dyestuff and metal ions, in which the coordination complex can be applied or used to be improvement factors in dye techniques. The investigation and the characterization of the resulted dyes were performed by using different physical techniques. The produced dyes were applied to different fibres, such as sheep wool and goat hair with two Schiff bases synthesised from salicylaldehyde either with 2-aminophenol or 2-aminobenzyl alcohol. Also the investigation includes the effect of mordant type on the dyeing process.
Highlights
The aim of our present study is to synthesize and to introduce the Schiff base which engaged in the complexation to see the usefulness in dyeing techniques, in which the phenolic and benzylic hydroxyl groups involve these reactions
The obtained results in dyeing with the Schiff base-I is summarized in Table 1, shows the effects on wool and goat hair samples
Hydroxyl or azomethine groups of Schiff bases can coordinate to metal ions, either by coordination or by forming ionic bonds
Summary
The formation of azomethine group and a large number of Schiff bases and their complexes, which have received considerable attention, and became an important subject in the areas of coordination chemistry, biology and pharmaceutical science, were synthesized and investigated. The Schiff base, obtained from 2-thiophenecarboxaldehyde and 2-aminobenzoic acid and its metal complexes, shows antibacterial activity. W. Hofmann, from 1845 onwards, that focused the attention of organic chemists on benzene and other such aromatic compounds obtained from coal tar. A British Chemist, whilst working with Hofmann, discovered Mauveine, in 1856 at the age of 18, and thereby started the “dyestuff revolution”. He was not intentionally working towards preparing synthetic dyestuffs but towards quinine. A lot of applications of synthetic colors have been applied to natural products as we can see the following Scottish Blackface Sheep stained with orange colored or the other applications [17]
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