Effects of methyl substituent on the charge-transfer complexations of dicarbazolylalkanes with p-chloranil, tetracyanoethylene and tetracyanoquinodimethane
作者:Erol Asker、Ece Uzkara、Orhan Zeybek
DOI:10.1016/j.saa.2011.05.047
日期:2011.9
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)
Both syn- and anti-[2.n](3,9)carbazolophanes (n = 4, 5) were obtained by the intramolecular [2 + 2] photocycloaddition of bis(3-vinyl-N-carbazolyl)alkanes. In the case of n = 4, the syn-isomer afforded sandwich excimer fluorescence, whereas the anti-isomer gave monomer fluorescence. (C) 1999 Elsevier Science Ltd. All rights reserved.