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Proton transfer complexes based on some pi-acceptors haying acidic protons with 3-amino-6-{[}2-(2-thienyl)vinyl]-1,2,4-triazin-5(4H)-one donor: Synthesis and spectroscopic characterizations
Faculty
Science
Year:
2011
Type of Publication:
Article
Pages:
116-124
Authors:
Refat, Moamen S, Adam, Abdel Majid A, Saad, Hosam A
DOI:
10.1016/j.molstruc.2011.04.001
Journal:
JOURNAL OF MOLECULAR STRUCTURE ELSEVIER SCIENCE BV
Volume:
995
Research Area:
Chemistry
ISSN
ISI:000292230100016
Keywords :
3-Amino-6(2-(2-thienyl)vinyl]-1, 2, 4-triazin-5(4H)-one (ArNH(2)), Picric acid, Hydroquinone, 3, 5-Dinitrobenzene, Charge transfer complexes
Abstract:
Charge transfer complexes based on 3-amino-6-{[}2-(2-thienyl)vinyl]-1,2,4-triazin-5(4H)-one (ArNH(2)) organic basic donor and pi-acceptors having acidic protons such as picric acid (PiA), hydroquinone (Q(OH)(2)) and 3,5-dinitrobenzene (DNB) have been synthesized and spectroscopically studied. The -NH(3)(+) ammonium ion was formed under the acid-base theory through proton transfer from an acidic to basic centers in all charge transfer complexes resulted. The values of formation constant (K(CT)) and molar extinction coefficient (epsilon(CT)) which were estimated from the spectrophotometric studies have a dramatic effect for the charge transfer complexes with differentiation of pi-acceptors. For further studies the vibrational spectroscopy of the {[}(ArNH(3)(+))(PiA(-))] (1), {[}(ArNH(3)(+))(Q(OH)(2)(-))] (2) and {[}(ArNH(3)(+))(DNB(-))] (3) of (1:1) charge transfer complexes of (donor: acceptor) were characterized by elemental analysis, infrared spectra. Raman spectra, (1)H and (13)CNMR spectra. The experimental data of elemental analyses of the charge transfer complexes (1), (2) and (3) were in agreement with calculated data. The IR and Raman spectra of (1), (2) and (3) are indicated to the presence of bands around 3100 and 1600 cm(-1) distinguish to. The thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) techniques were performed to give knowledge about thermal stability behavior of the synthesized charge transfer complexes. The morphological features of start materials and charge transfer complexes were investigated using scanning electron microscopy (SEM) and optical microscopy. (C) 2011 Elsevier B.V. All rights reserved.
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