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    Synthesis, characterization and spectroscopic structural studies of charge-transfer complexes of 1,4,8,11-tetraazacyclotetradecane-5,7-dione with iodine, TCNE and DDQ

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    1-s2.0-S0022286010005855-main.pdf (886.4Kb)
    Date
    2010-09-10
    Author
    El-Metwally, Nour
    AlQaradawi, Siham Y.
    Mostafa, Adel
    Shams, Eman
    Bazzi, Hassan S.
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    Abstract
    Three novel aqueous and solid charge-transfer complexes are synthesized by the reaction of the polynitrogen cyclic n-donor 1,4,8,11-tetraazacyclotetradecane-5,7-dione (TACTDD) with the σ-acceptor iodine, the aliphatic π-acceptor tetracyanoethylene (TCNE) as well as with the aromatic π-acceptor 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) using chloroform as the medium solvent. Photometric titration measurements of the CT-solution complexes confirm the donor to acceptor ratios are 1:2 for TACTDD–I2 and TACTDD–TCNE reactions while is 1:1 for the reaction TACTDD–DDQ. These reaction stoichiometries are supported by the elemental, thermal and infrared measurements for the formed CT-solids. Accordingly, the reaction products are formulated as [(TACTDD) I]⋅I3, [(TACTDD)(TCNE)2] and [(TACTDD)(DDQ)]. The effect of the substituents, electron donating or withdrawing groups in the donor and acceptors compositions on their CT-interactions is discussed.
    URI
    http://www.sciencedirect.com/science/article/pii/S0022286010005855
    DOI/handle
    http://dx.doi.org/10.1016/j.molstruc.2010.07.017
    http://hdl.handle.net/10576/5286
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    • Chemistry & Earth Sciences [‎613‎ items ]

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