Synthesis and spectroscopic studies of the charge transfer complexes of 2- and 3-aminopyridine

Adel Mostafa, Hassan S. Bazzi

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The interactions of the electron donors 2-aminopyridine (2APY) and 3-aminopyridine (3APY) with the π-acceptors tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), 2-chloro-1,3,5-trinitrobenzene (picryl chloride, PC), and 2,3,5,6-tetrachloro-1,4-benzoquinone (chloranil) were studied spectrophotometrically in chloroform at room temperature. The electronic and infrared spectra of the formed molecular charge transfer (CT) complexes were recorded. Photometric titration showed that the stoichiometries of the reactions were fixed and depended on the nature of both the donor and the acceptor. The molecular structures of the CT-complexes were, however, independent of the position of the amino group on the pyridine ring and were formulated as [(APY)(TCNE)], [(APY)(DDQ)], [(APY)(PC)], and [(APY) (chloranil)]. The formation constants (KCT), charge transfer energy (ECT) and molar extinction coefficients (εCT) of the formed CT-complexes were obtained.

Original languageEnglish
Pages (from-to)180-187
Number of pages8
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Issue number1
Publication statusPublished - 15 Sep 2009



  • 2-Aminopyridine
  • 3-Aminopyridine
  • CT-complexes
  • Chloranil
  • DDQ
  • Picryl chloride
  • Spectra
  • TCNE

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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