Abstract
Charge-transfer complexes (CTC) resulting from interactions of 1,3-di[(E)-1-(2-hydroxyphenyl) methylidene-amino]-2-propanol Schiff base with some acceptors such as iodine (I-2), bromine (Br2), and picric acid (PiA) have been isolated in the solid state in a chloroform solvent at room temperature. Based on elemental analysis, UV-Vis, infrared, and H-1 NMR spectra, and thermogravimetric analysis (TG/DTG) of the solid CTC, [(Schiff)(I-2)] (1), [(Schiff)(Br-2)] complexes with a ratio of 1:1 and [(Schiff)(PiA)(3)] complexes with 1:3 have been prepared. In the picric acid complex, infrared and H-1 NMR spectroscopic data indicate that the charge-transfer interaction is associated with a hydrogen bonding, whereas the iodine and bromine complexes were interpreted in terms of the formation of dative ion pairs [Schiff(+), I-2(center dot-) ] and [Schiff(+), Br-2(center dot-)], respectively. Kinetic parameters were obtained for each stage of thermal degradation of the CT complexes using Coats-Redfern and Horowitz-Metzger methods. DC electrical properties as a function of temperature of these charge transfer complexes have been studied.