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Polyaromatic hydrocarbons are model compounds for graphite and have interesting electronic and optoelectronic properties. The synthesis and preliminary characterization of hexaalkyl‐substituted hexa‐peri‐hexabenzocoronenes (see figure) are described. It is shown that they exhibit hexagonal columnar mesophases with remarkably large widths, e.g., 339K for R = nC12H25. magnified image

COMMUNICATIONS[I31 Crystal structure of 1: triclinic. space group PT. (I = 13 511(3). b = 11.262(3), (=14.XX9(4)A, 2 =116.631(10). /1=96.498(133, ;=l13.S41(9)", V = 2188.6(X) A', Z = 2, ~J~.~~~ =1.505 gem-', data collrcti~ii at T = 293 K with an Enraf Noniuc CAD4 diffractometer, Cu,, radiation, j. = 1.51056. fl = 14.555. F(000) = 1016, R467 reflections measured. ofwlrich 7423 were independent, (R,,, = 0.043), hkl range -1 -15. kl6. 17. Structure solution with

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