Synthesis, spectroscopic, thermal and structural investigations of charge-transfer complexes of 4,4′-trimethylenedipiperidine with chloranil, TBCHD, DDQ, TCNQ and iodine

The charge-transfer interactions between the electron donor 4,4'-trimethylenedipiperidine (TMDP) and the acceptors 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil), 2,4,4,6-tetrabromo-2,5-cyclohexadienone (TBCHD), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), 7,7',8,8'-tetracyanoquinodimethane (TCNQ) and iodine have been studied spectrophotometrically in CHCl3 solutions. The formed solid charge-transfer complexes were also isolated and characterized through infrared spectra as well as thermal and elemental analysis. The stoichiometry of the complexes was found to be 1: 1 in the case of TMDP-chloranil and TMDP-TBCHD systems and 1: 2 in the case of TMDP-DDQ and TMDP-TCNQ systems and 1:3 in the case of TMDP-iodine system. Taking this into consideration along with infrared spectra and thermal and elemental analysis, the formed CT-complexes have the formulas [(TMDP)(chloranil)], [(TMDP)(TBCHD)], [(TMDP)(DDQ)(2)] [(TMDP)(TCNQ)(2)] and [(TMDP)I](+)center dot I-5(-), respectively. (C) 2009 Elsevier B.V. All rights reserved.