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Communications ADVANCED MATERIALSfield dipolar coupling effects lead to two absorption modes that are polarized in the x-and y-directions and observed at the frequencies w, and w, with w, < w,, if a < b.

A new kind of discotic liquid crystal has been investigated where one out of the six ether side chains of a triphenylene core was replaced by an ester side chain. We have found greatly increased clearing temperatures and suppressed crystallization thus leading to glass forming discotics. Here we report the synthesis, X-ray and dielectric studies concerning the nature of the glass transition. Furthermore we give arguments as to why a 'mixed' substitution can lead to such drastic effects.