Preparation and spectroscopic studies on charge-transfer complexes of 2-hydroxypyridine with electron acceptors

The CT-interactions of electron acceptors such as iodine (I-2), chloranilic acid (H(2)CA) and 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) with 2-hydroxypyridine (HPyO) have been investigated in the defined solvent. The data indicate the formation of CT-complexes with the general formula RHPyO)(acceptor)]. The 1:1 stoichiometry of the (HPyO)-acceptors were based on elemental analysis, IR spectra and thermogravimetric analysis of the solid CT-complexes along with the photometric titration measurements for the reactions. The formation constants (Kcr) for the CT-complexes are shown to be strongly dependent on the type and structure of the electron acceptors. Factors affecting the CT-processes are discussed. (C) 2013 Elsevier B.V. All rights reserved.