Publications by authors named "Erol Asker"

3 Publications

  • Page 1 of 1

Effects of methyl substituent on the charge-transfer complexations of dicarbazolylalkanes with p-chloranil, tetracyanoethylene and tetracyanoquinodimethane.

Spectrochim Acta A Mol Biomol Spectrosc 2011 Sep 7;79(5):1731-8. Epub 2011 Jun 7.

Balıkesir University, Department of Chemistry Education, 10100 Balıkesir, Turkey.

Series of 1,n-dicarbazolylalkanes and 1,n-di(3-methylcarbazolyl)alkanes (where n=1-5) were synthesized and the molar extinction coefficients, equilibrium constants, enthalpies, and entropies of their charge-transfer (CT) complexes with the π-acceptors p-chloranil, tetracyanoethylene, and tetracyanoquinodimethane were investigated. 1,n-Di(3-methylcarbazolyl)alkanes formed CT complexes with higher equilibrium constants, more negative enthalpies and entropies than 1,n-dicarbazolylalkanes. Vibrational spectra of CT complexes of one of the donor molecules (1,4-dicarbazolylbutane) with all three acceptors were compared.
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http://dx.doi.org/10.1016/j.saa.2011.05.047DOI Listing
September 2011

N-[(E)-(9-Ethyl-9H-carbazol-3-yl)methyl-idene]aniline.

Acta Crystallogr Sect E Struct Rep Online 2010 May 26;66(Pt 6):o1456. Epub 2010 May 26.

The title compound, C(21)H(18)N(2), was obtained as the product of the reaction between 9-ethyl-9H-carbazole-3-carbaldehyde and aniline in ethanol. The crystal packing is stabilized mainly by C-H⋯π inter-actions between the carbazole benzene rings and the methyl-ene H atoms.
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http://dx.doi.org/10.1107/S1600536810018660DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2979658PMC
May 2010

Charge-transfer complexations of 1,n-di(9-ethylcarbazol-3-yl)alkanes with tetracyanoethylene and tetranitromethane.

Spectrochim Acta A Mol Biomol Spectrosc 2009 Jan 3;71(5):1973-8. Epub 2008 Aug 3.

Balikesir University, Necatibey Faculty of Education, Department of Chemistry Education, 10100 Balikesir, Turkey.

1,n-Di(9-ethylcarbazol-3-yl)alkanes, where n=1-5, as the dichromophoric model compounds of poly-3-vinylcarbazoles were synthesized to examine their complexation behaviors with the electron acceptors tetracyanoethylene (TCNE) and tetranitromethane (TNM). 9,9'-Diethyl-3,3'-dicarbazolyl, di(3-ethylcarbazol-9-yl)methane, and three monomeric analogues were also included for comparison. In dichloromethane solution, the dicarbazoles formed stable 1:1 electron donor-acceptor complexes with TCNE having formation enthalpies around -3.5kcal/mol. With TNM they formed more weakly bound complexes that showed little dependence on concentration and almost zero dependence on temperature changes having nearly 0kcal/mol enthalpies of formation. The smaller gap between the two carbazole groups in 1,n-di(9-ethylcarbazol-3-yl)alkanes with nor=3.
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http://dx.doi.org/10.1016/j.saa.2008.07.034DOI Listing
January 2009