TY - JOUR
T1 - Synthesis, characterization and spectroscopic structural studies of charge-transfer complexes of 1,4,8,11-tetraazacyclotetradecane-5,7-dione with iodine, TCNE and DDQ
AU - Nour, El Metwally
AU - Alqaradawi, Siham Y.
AU - Mostafa, Adel
AU - Shams, Eman
AU - Bazzi, Hassan S.
PY - 2010/9/10
Y1 - 2010/9/10
N2 - 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.
AB - 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.
KW - 1,4,8,11-Tetraazacyclotetradecane-5,7-dione
KW - CT-complexes
KW - DDQ
KW - Iodine
KW - Spectra
KW - TCNE
UR - http://www.scopus.com/inward/record.url?scp=77956062149&partnerID=8YFLogxK
U2 - 10.1016/j.molstruc.2010.07.017
DO - 10.1016/j.molstruc.2010.07.017
M3 - Article
AN - SCOPUS:77956062149
SN - 0022-2860
VL - 980
SP - 218
EP - 224
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1-3
ER -