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Molecular spectroscopic studies of charge transfer complexes of thiourea derivatives with benzoquinones

✍ Scribed by E.H. EL-Mossalamy

Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 161 KB
Volume: 123
Category: Article
ISSN: 0167-7322
DOI: 10.1016/j.molliq.2005.07.003

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✦ Synopsis

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 (() and stoichiometric ratio. The effect of thermodynamic parameters (DG* and DH) 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, 1 H NMR and ESR spectroscopy. Nonacidic acceptors yield complexes having kk* and nk* bonding. Acidic acceptors yield complexes having kk* and proton transfer interaction. The formation of 1:2 (D:A) complexes is also ascertained.

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