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Journal of Chemistry
Volume 2013, Article ID 951529, 7 pages
Research Article

Synthesis and Electrical and Gas Sensing Properties of Some 5-(Quinolinylmethylene)-2-thioxodihydropyrimidine-4,6(1H,5H)-dione and 5-(Quinolinylmethylene)pyrimidine-2,4,6(1H,3H,5H)-trione Derivatives

1Department of Chemistry, Faculty of Science and Art, Davutpasa Campus, Yildiz Technical University, Esenler, 34220 Istanbul, Turkey
2Institute of Science and Technology, Yildiz Central Campus, Yildiz Technical University, Barbaros Bulvari, Besiktas, 34349 Istanbul, Turkey
3Department of Physics, Faculty of Science and Art, Davutpasa Campus, Yildiz Technical University, Esenler, 34220 Istanbul, Turkey

Received 5 June 2012; Accepted 29 August 2012

Academic Editor: Hakan Arslan

Copyright © 2013 H. Kerim Beker et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Eight new 5-(quinolinylmethylene)barbituric acid derivatives were synthesized by the reaction of 1,3-dimethylbarbituric acid and 1,3-diethyl-2-thiobarbituric acid with quinoline-4-carboxaldehydes and several quinoline-2-carboxaldehydes via Knoevenagel condensation. The novel compounds were characterized by 1H NMR, 13C NMR, mass, IR, and UV-visible spectral data and elemental analyses. d.c. and a.c. conduction properties of the compounds were investigated in the frequency range of 40–105 Hz and temperature range 295–440 K. The d.c. results showed an activated conductivity dependence on temperature for all films. Obtained data reveal that a.c. conductivity obeys the relation and exponent is found to decrease by increasing temperature. The analysis of the a.c. conduction data showed that the CBH model is the dominant conduction mechanism for the electron transport in the films. Gas sensing properties of the films for the volatile organic compounds (VOCs) were also investigated in the same temperature range. Maximum sensitivity to VOCs was observed at around 360 K for compound 6.