摘要 : The interactions of the electron donors piperazine (PIP) and N,N'-dimethylpiperazine (DMPIP) with the sigma-acceptor iodine and the pi-acceptors tetracyanoethylene (TCNE) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) were st... 展开 The interactions of the electron donors piperazine (PIP) and N,N'-dimethylpiperazine (DMPIP) with the sigma-acceptor iodine and the pi-acceptors tetracyanoethylene (TCNE) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) were studied spectrophotometrically in chloroform at 25 degrees 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]I-+(3)-, [(PIP)(TCNE)(2)], [(PIP)(DDQ)(2)], [(DMPIP)(4)I]I-+(3)-, [(DMPIP)(TCNE)(2)] and [(DNIPIP)(DDQ)(2)]. A general mechanism explaining the formation of triiodide complexes was suggested. (C) 2007 Elsevier B.V. All rights reserved. 收起