Abstract
UV–VIS absorption spectroscopy has been used to characterize the cationic species produced by doping the discotic liquid crystal 2,3,6,7,10,11-hexahexyloxytriphenylene (HAT6,1) with aluminium trichioride. A comparison of the spectrum for the conducting doped liquid crystal with those obtained by oxidising HAT6 in solution establishes that the product in both systems is one in which a single charge is confined to a single molecule, i.e. the radical cation HAT6˙+ rather than a non-covalently bound dimer (HAT6)2˙+.
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