UV–Vis, IR spectra, mass spectrometry and thermal studies of charge transfer complexes formed in the reaction of 1, 4, 8, 11-tetraazacyclotetradecane with π-electron acceptors
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© 2019 The solid charge-transfer (CT) molecular complexes formed in the reaction of the electron donor 1,4,8,11-tetraazacyclotetradecane (TACTD) with the π-electron acceptors 2,4,6-tetrafluoro-1,4-benzoquinone (TFQ), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and 2,4,4,6-tetrabromo-2,5-cyclohexadienone (TBCHD) have been investigated spectrophotometrically in chloroform at 25 °C. These were characterized through electronic and infrared spectra as well as elemental and thermal analysis. The obtained results showed that the formed solid CT-complexes have the formulas [(TACTD)(TFQ) 2 ] and [(TACTD)(DDQ) 2 ] and [(TACTD)(TBCHD) 2 ] in full agreement with the known reaction stoichiometry in solution as well as the elemental measurements. The formation constant k CT , molar extinction coefficient ε CT , free energy change ΔG 0 , CT energy E CT and the ionization potential Ip have been calculated for these CT-complexes.
author list (cited authors)
Mostafa, A., Madrahimov, S., Fadlallah, J., & AlQaradawi, S. Y.