| المستخلص: |
The research work in this thesis composed of two parts, which are: Part One: Organic Synthesis The synthesis of azo- Schiff bases includes the following steps and reactions: 1. Azo- amine compounds [2 ,11, 19, 26, 33] have been prepared from diazonuim salts derived from aniline and some derivates thereof besides benzidene with aniline and its some derivatives at (0- 5°c) . 2. Some azo- Schiff base compounds, [3-9] and [12-17] were prepared from reacting the azo- amines [2] and [11] respectively with some aromatic aldehydes with deferent substituents at (4) position with equal millimoles in absolute Ethanol. Whereas, bis azo- bis Shiff bases [10], and [18] were prepared by reacting two millimoles of azo- amines [2] and [11], respectively, with uni millimole of terephthalaldehyde in absolute ethanol. 3. Azo- Schiff bases [20-25] and [27-32] were prepared from reacting azo- amines [19] and [26], respectively, with some substituted aromatic alaldehydes at the (4) position in equivalent millimoles in absolute ethanol at acidic media. 4. Bis azo- bis Schiff bases [34-37] were prepared by fussion of one miliequivalent of the azo - amine [33] with two milliequvalents some substituted aromatic aldehydes in the (4) position. 5. Azo- aldehyde [38] was prepared by reacting the diazonium salt derived from 4- Nitroaniline with Salicylicaldehyde at (0-5)°c. 6. The azo- hydrazone [39] was prepared from the interaction of azo - aldehyde [38] with 2-4 dinitro phenylhydrazine in ethanol at acidic media. 7. Azo – Schiff bases [40, 41] and [42, 43] were prepared by reacting the azo - aldehyde [38] with some substituted aromatic amines, and the azo- amines [2, 11] prepared earlier in this research, respectively, at equal millimoles in absolute ethanol. 8. Bis azo – Schiff bases [44-46] were prepared by reacting uni millimole of [38] with two millimoles of some aliphatic and aromatic amines in absolute ethanol. The prepared compounds were identified using spectral methods available; results indicated the trueness of the proposed structures. Part Two: The photochemical studies of the prepared compounds In this part, thermal performance and photo stabilities of the compounds prepared in this study were tested by subjecting them as solutions in dimethyl sulfoxide to direct sunlight. The results of exposure showed an increase in temperature of azo- Schiff bases compared to the solvent and the azo- amine derived from them ranged between (3-7) degrees across the exposing system manufactured in this study. The Photo stability studies towards the sun light proved stability of the prepared azo- Schiff bases compared to Congo red dye, one of the most azo dyes that have been selected as a reference for comparison, as well as to the azo- Schiff bases derived from.
|
