TY - JOUR
T1 - Charge-transfer complexes of 4-methylpiperidine with σ- And π-acceptors
AU - Alqaradawi, Siham Y.
AU - Mostafa, Adel
AU - Bazzi, Hassan S.
PY - 2015/1/25
Y1 - 2015/1/25
N2 - The solid charge-transfer (CT) molecular complexes formed in the reaction of the electron donor 4-methylpiperidine (4MP) with the σ-electron acceptor iodine and π-acceptors 7,7,8,8-tetracyanoquinodimethane (TCNQ), 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 [(4MP) I] +I-3, [(4MP)(DDQ)2] and [(4MP)(TBCHD)] and with TCNQ the adduct [TCMPQDM] is obtained through N-substitution reaction in full agreement with the known reaction stoichiometries in solution as well as the elemental measurements. The formation constant KCT, molar extinction coefficient εCT, free energy change ΔG0, CT energy ECT and the ionization potential Ip have been calculated for the CT-complexes [(4MP) I] +I-3, [(4MP)(DDQ)2] and [(4MP)(TBCHD)].
AB - The solid charge-transfer (CT) molecular complexes formed in the reaction of the electron donor 4-methylpiperidine (4MP) with the σ-electron acceptor iodine and π-acceptors 7,7,8,8-tetracyanoquinodimethane (TCNQ), 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 [(4MP) I] +I-3, [(4MP)(DDQ)2] and [(4MP)(TBCHD)] and with TCNQ the adduct [TCMPQDM] is obtained through N-substitution reaction in full agreement with the known reaction stoichiometries in solution as well as the elemental measurements. The formation constant KCT, molar extinction coefficient εCT, free energy change ΔG0, CT energy ECT and the ionization potential Ip have been calculated for the CT-complexes [(4MP) I] +I-3, [(4MP)(DDQ)2] and [(4MP)(TBCHD)].
KW - 4-Methylpiperidine
KW - DDQ
KW - Iodine
KW - Spectra
KW - TBCHD
UR - http://www.scopus.com/inward/record.url?scp=84907343647&partnerID=8YFLogxK
U2 - 10.1016/j.saa.2014.07.050
DO - 10.1016/j.saa.2014.07.050
M3 - Article
C2 - 25123938
AN - SCOPUS:84907343647
SN - 1386-1425
VL - 135
SP - 498
EP - 505
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ER -