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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 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
Externally publishedYes

Keywords

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

Fingerprint

Dive into the research topics of 'Synthesis, spectroscopic and thermal studies of the reactions of the donors piperazine and N,N′-dimethylpiperazine with σ- and π-acceptors'. Together they form a unique fingerprint.

Cite this