Spectroscopic studies of new symmetrical schiff base compounds derived from 7-formyl-8-hydroxyquinoline with aliphatic and aromatic diamines

The electronic absorption spectra of some new symmetrical Schiff bases derived from 7-formyl-8-hydroxyquinoline [FHQ] with aliphatic and aromatic diamines are investigated in organic solvents of varying polarities. The important bands in the IR spectra of the compounds as well as the main signals in the 1HNMR spectra were discussed in relation to molecular structure. Mass spectra and the mechanism leading to different fragment ions of the compounds were also discussed

Voltametric studies on some substituted 5-arylazo-2-thiohydantoins in non-aqueous medium

5-arylazo-2- thiohydantoins were electrochemically studied in benzonitrile containing 0.1 M tetrabutylammonium perchlorate as supporting electrolyte using DC-, cyclic voltametry [CV] coulometry and controlled potential electrolysis [CPE]. They are oxidized and reduced in two successive two-electron processes. The first oxidation and the second reduction waves are characteristic for the thiohydantoin ring, while the second oxidation and the first reduction waves correspond to the azo group