TY - JOUR
T1 - Synthesis, spectroscopic and thermal studies of the reactions of the donors piperazine and N,N′-dimethylpiperazine with σ- and π-acceptors
AU - Bazzi, Hassan S.
AU - AlQaradawi, Siham Y.
AU - Mostafa, Adel
AU - Nour, El Metwally
PY - 2008/5/15
Y1 - 2008/5/15
N2 - 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.
AB - 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.
KW - CT-complexes
KW - DDQ
KW - Iodine
KW - N,N′-Dimethylpiperazine
KW - Piperazine
KW - TCNE
UR - http://www.scopus.com/inward/record.url?scp=42649096675&partnerID=8YFLogxK
U2 - 10.1016/j.molstruc.2007.08.019
DO - 10.1016/j.molstruc.2007.08.019
M3 - Article
AN - SCOPUS:42649096675
SN - 0022-2860
VL - 879
SP - 60
EP - 71
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1-3
ER -