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Structural, Vibrational and Electronic Spectral Analysis of Charge-Transfer Complexation between Three Triazine-Stilbene Derivatives with some -Acceptors. Part Four : DDQ

Moamen S. Refat, Abdel Majid A. Adam and Lamia A. Ismail

Design and development of triazine-stilbene derivatives have gained extensive attention in the last decade due to their substantially potential applications in textiles and papers industry. In this work, three novel charge-transfer (CT) complexes formed on the reaction between three disodium 4,4′-bis- (1,3,5-triazinylamino)stilbene-2,2′-disulfonate derivatives with dichlorodicyanobenzoquinone (DDQ) were synthesized and characterized by electronic, IR spectroscopy and elemental analysis. The structural investigations exhibit that the CT chelation between donors and DDQ acceptor occurs via π→π* transitions. Based on elemental analyses and photometric titrations, the stoichiometry of the complexes (donor: DDQ molar ratios) was determined to be 1 : 2. The formation constant (KCT), molar extinction coefficient (εCT) and other spectroscopic data have been determined using the Benesi–Hildebrand method and its modifications.