Multiynes radial

Likewise, as for instance analogously substituted members of the radial multiyne families 3a and 3C compiled in TABLE 3, demonstrate, it seems friat the wider their molecular core, the more stable and broader the No phase formed on heating [12]. Re-entrant occiurences of an No phase are also known,... 

TABLE 3 Transition temperatures ( C, on heating) of forty-six derivatives of six different radial multiynes (type 3a to 3f) and of the cyclic multiyne type 3g with siq>er-disc cores of different diameters each exhibiting mostly an No phase wliich in four cases of group 3e are inverse. 

Five of the radial multiynes of the types 3b, 3c, and 3e exhibit die chiral nematic discotic (N d) phase. 

However, in contrast to their fascinating flat molecular structures voy little attention has y been paid to possible applications. Probabfy, more discotic materials with still lower phase transition temperatures must be designed fmr such purposes. An into esting ( >tically controlled electro-optic effect in discotic nematic radial multiynes has been observed very recently [57], and hopefully, this encouraging experience will induce more and systematic work on these materials. 

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