IR, H-1-NMR, UV-Vis AND THERMAL STUDIES ON THE RHODAMINE 6G CHARGE-TRANSFER COMPLEXES

Charge-transfer (CT) complexes formed between Rhodamine 6G (Rh6G) as donor with iodine, CLA and PA as acceptors have been studied spectrophotometrically. The synthesis and characterization of Rhodamine 6G CT-complexes of iodine, {[}(Rh6G) 2]I+center dot I-3(-), chloranilic acid (CLA), {[}(Rh6G)(CLA)] and picric acid (PA) {[}(Rh6G)(PA)] were described. These complexes are readily prepared from the reaction of Rh6G with I-2, CLA and PA with CHCl3 solvent. Mid and far IR, H-1-NMR, UV-Vis techniques, elemental analyses (CHN) and thermal studies, characterize the three new Rhodamine 6G charge-transfer complexes. Modified Benesi-Hildebrand method was applied to the determination of association constant and molar extinction coefficient.