Synthesis, spectroscopic and thermal studies of the reactions of the donors piperazine and N,N′-dimethylpiperazine with σ- and π-acceptors

Hassan S. Bazzi, Siham Y. AlQaradawi, Adel Mostafa, El Metwally Nour

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The interactions of the electron donors piperazine (PIP) and N,N′-dimethylpiperazine (DMPIP) with the σ-acceptor iodine and the π-acceptors tetracyanoethylene (TCNE) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) were studied spectrophotometrically in chloroform at 25 °C. The electronic and infrared spectra of the resulting charge-transfer complexes were recorded, in addition to thermal analysis. The results obtained showed that the stoichiometries of the reactions are not fixed and depend on the nature of both the donor and the acceptor. The formed CT-complexes have the formulas of [(PIP)2 I]+ I3-, [(PIP)(TCNE)2], [(PIP)(DDQ)2], [(DMPIP)4 I]+ I3-, [(DMPIP)(TCNE)2] and [(DMPIP)(DDQ)2]. A general mechanism explaining the formation of triiodide complexes was suggested.

Original languageEnglish
Pages (from-to)60-71
Number of pages12
JournalJournal of Molecular Structure
Volume879
Issue number1-3
DOIs
Publication statusPublished - 15 May 2008

Fingerprint

quinones
Chlorine compounds
Iodine
chloroform
electronic spectra
Stoichiometry
Thermoanalysis
iodine
Charge transfer
stoichiometry
thermal analysis
infrared spectra
Hot Temperature
charge transfer
Infrared radiation
Electrons
synthesis
electrons
interactions
Chloroform

Keywords

  • CT-complexes
  • DDQ
  • Iodine
  • N,N′-Dimethylpiperazine
  • Piperazine
  • TCNE

ASJC Scopus subject areas

  • Structural Biology
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)

Cite this

Synthesis, spectroscopic and thermal studies of the reactions of the donors piperazine and N,N′-dimethylpiperazine with σ- and π-acceptors. / Bazzi, Hassan S.; AlQaradawi, Siham Y.; Mostafa, Adel; Nour, El Metwally.

In: Journal of Molecular Structure, Vol. 879, No. 1-3, 15.05.2008, p. 60-71.

Research output: Contribution to journalArticle

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AU - Mostafa, Adel

AU - Nour, El Metwally

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