Collect. Czech. Chem. Commun. 1993, 58, 2846-2852

Charge-Transfer Complexes of Some Heteroarylthiourea Derivatives with π-Acceptors

Maher M. A. Hameda, Hassan M. A. Salmanb, Elham M. Abd-Allac and Mohamed R. Mahmouda

a Department of Chemistry, Faculty of Science, Assiut University, Assiut 715 16, Egypt
b Department of Chemistry, Faculty of Science (Qena), Assiut University, Qena 8351, Egypt
c Department of Chemistry, Faculty of Science, Minia University, Minia 61511, Egypt


Charge-transfer complexes of some heteroarylthiourea derivatives with π-accptors have been studied spectrophotometrically in CH2Cl2. Spectral data, stability constants and enthalpies of complexation are reported. From the energies of the CT transition, ionization potentials of the donors have been obtained. Effects of donor molecular structure, π-acceptor electron affinity and nature of solvent on KCT of complexes are investigated and discussed. It is deduced that the formed CT complexes are of n-π kind and of 1 : 1 stoichiometry.