Synthesis, spectroscopic and thermal studies of charge-transfer molecular complexes formed in the reaction of 1,4-bis (3-aminopropyl) piperazine with sigma- and pi acceptors
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In the present study, solid charge-transfer (CT) molecular complexes formed in the reaction of the electron donor 1,4-bis (3-aminopropyl) piperazine (APPIP) with the -electron acceptor iodine and -acceptors 7,7,8,8-tetracyanoquinodimethane (TCNQ), tetracyanoethylene (TCNE), 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 [(APPIP) I] + I3-, [(APPIP)(TCNQ)], [(APPIP) 2(TCNE) 3], [(APPIP)(DDQ)] and [(APPIP)(TBCHD)] in full agreement with the known reaction stoichiometries in solution as well as the elemental measurements. The formation constant K CT, molar extinction coefficient CT, free energy change G 0, CT energy E CT and the ionization potential Ip have been calculated for the CT complexes [(APPIP) I] + I3-, [(APPIP)(TCNQ)], [(APPIP)(DDQ)] and [(APPIP)(TBCHD)]. 2012 Elsevier B.V. All rights reserved.
JOURNAL OF MOLECULAR STRUCTURE
author list (cited authors)
AlQaradawi, S. Y., Mostafa, A., & Bazzi, H. S.
complete list of authors
AlQaradawi, Siham Y||Mostafa, Adel||Bazzi, Hassan S