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

Journal
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
Publisher
Elsevier
Publication Date
Jan 01, 2009
Volume
74
Issue
1
Identifiers
DOI: 10.1016/j.saa.2009.06.004
Keywords
Disciplines
  • Physics
License
Unknown

Abstract

Abstract 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 ( K CT), charge transfer energy ( E CT) and molar extinction coefficients ( ɛ CT) of the formed CT-complexes were obtained.

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