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Title of article :
Guest–host interactions between dichroic dyes and anisotropic hosts
Author/Authors :
Lars-Olof P?lsson، نويسنده , , Helen L. Vaughan، نويسنده , , Andrew Smith، نويسنده , , Marek Szablewski، نويسنده , , Graham H. Cross، نويسنده , , Tony Roberts، نويسنده , , Akira Masutani، نويسنده , , Akio Yasuda، نويسنده , , Andrew Beeby، نويسنده , , Tony Blythe, David Bloor، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
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Abstract :
The guest–host interaction between dichroic dyes and anistropic hosts has been investigated by means of optical spectroscopy. Two different TCNQ adducts; 2-{4-[(2,6-dimethylmorpholin-4-yl)(4-metylpiperidin-1-yl)methylene]cyclohexa-2,5-dien-1-ylidene} malononitrile (MORPIP) and 2-{4-[cyclohex-1-yltetrahydropyrimidin-2(1H-ylidene]cyclohexa-2,5-dien-1-ylidine} malononitrile (AMINO) have been examined dispersed in a range of nematic liquid crystal mixtures. The result is a substantial impact on the absorption and luminescence when compared to the situation in isotropic solvents. The excited state decay exhibits a complex behaviour showing a multi-exponential decay of the time-resolved luminescence. The photoluminescence quantum yields of the chromophores, also shows strong host dependence. For AMINO, we observe a trend which is indicative of a viscosity dependence. The observations are discussed in view of different solvent–solute interactions between guest and host.
Keywords :
ABSORPTION , Anistropic host , Dichroic dyes , Guest–host interactions , Hydrogen bonds , isomerisation , Isotropic solvent , Liquid crystals , Luminescence
Journal title :
Journal of Luminescence
Link To Document :