The spectrophotometric characteristics of the solid charge-transfer molecular complexes (CT) formed in the reaction of the electron donors imidazole (IML) and 1-benzylimidazole (BIML) with the σ-acceptor iodine and π-acceptors 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), tetracyanoethylene (TCNE) and 2,3,5,6-tetrachloro-1,4-benzoquinone (CHL) have been studied in chloroform at 25 °C. These were investigated through electronic and infrared spectra as well as elemental analysis. The results show that the formed solid CT-complexes have the formulas [(IML) 2 I]I 3, [(IML)(DDQ)], [(IML) 2(TCNE) 5] and [(IML)(CHL)] for imidazole and [(BIML) I]I 3, [(BIML)(DDQ) 2], [(BIML)(TCNE) 2] and [(BIML)(CHL) 2] for 1-benzylimidazole in full agreement with the known reaction stoichiometries 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 ionization potential Ip have been calculated for the CT-complexes [(IML) 2 I]I 3, [(IML)(DDQ)], [(IML)(CHL)], [(BIML) I]I 3, [(BIML)(DDQ) 2], [(BIML)(TCNE) 2] and [(BIML)(CHL) 2].
|Number of pages||8|
|Journal||Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy|
|Publication status||Published - Sep 2011|
ASJC Scopus subject areas
- Analytical Chemistry
- Atomic and Molecular Physics, and Optics