Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2011-09-01

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

Erol Asker, Ece Uzkara, Orhan Zeybek

Index: Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 79(5) , 1731-8, (2011)

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Abstract

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.Copyright © 2011 Elsevier B.V. All rights reserved.