Synthesis, spectroscopic and thermal studies on solid charge-transfer molecular complexes formed in the reaction of 1-(2-aminoethyl)piperidine with pi- and sigma-acceptors
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abstract
The solid charge-transfer molecular complexes formed in the reaction of the electron donor 1-(2-aminoethyl) piperidine (AEP) with the -acceptor iodine and -acceptors 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 2,4,4,6-tetrabromo-2,5- cyclohexadienone (TBCHD)were studied in chloroform at 25 0C. These were investigated through electronic spectra, infrared spectra, thermal and elemental analysis. The obtained results showed that the formed solid CT-complexes have the formulas [(AEP)I]+I3-, [(AEP)(DDQ) 2], [(AEP)(TCNQ)2] and [(AEP)(TBCHD)] in full agreement with the known reaction stoichiometries in solution as well as the elemental measurements. The formation constant KCT (L mol-1), the molar extinction coefficient *CT (L mol-1 cm -1), the free energy change G (cal mol-1), the charge transfer energy ECT, and the ionization potential Ip were calculated for the CT-complexes [(AEP)I]+I3-, [(AEP)(DDQ) 2], [(AEP)(TCNQ)2] and [(AEP)(TBCHD)]. 2012 Elsevier B.V. All rights reserved.
