Abstract
Charge transfer complexes of substituted-
N-aryl-
N-4-(-
p-anisyl-5-arylazothiazolyl)thiourea with 2,3-dichloro-5,6-dicyanobenzoquinones (DDQ), chloranilic acid (CHLA), chloranil (CHL), bromanil (BRL) and iodanil (IDL) in methylene chloride were investigated spectrophotometrically to determine association constants (
K), molar extinction coefficients (
ε) and stoichiometric ratio. The effect of thermodynamic parameters (Δ
G* and Δ
H) on the stability of the complexes are discussed and the transition energy (
E) of the CT complexes are reported. The solid CT complexes of the substituted-
N-aryl-
N-4-(-
p-anisyl-5-arylazothiazolyl)thiourea with the above acceptors have been prepared and investigated by IR, electronic,
1H NMR and ESR spectroscopy. Nonacidic acceptors yield complexes having π–π* and n–π* bonding. Acidic acceptors yield complexes having π–π* and proton transfer interaction. The formation of 1:2 (D:A) complexes is also ascertained.