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5In our previous work, we synthesized a series of phthalocyanine-based flying-seed-like compounds, (nPh-PhO) 4 PcCu (n = 3, 2, 1 and 0 in nPh-PhO: a, b, c and d), and revealed that each of them shows a columnar liquid crystalline phase (Col ho or Col rho ) from rt to an extremely high temperature near 500 o C.Thus, we could obtain columnar liquid crystalline phases for discotic compounds by using bulky substituents (a~d) instead of long alkyl chains. In order to furthermore study the utility of these bulky and that balance of core size and bulkiness of substients is very important to obtain mesomorphism in flying-seed-like compounds.We believe that this is a new guideline for induction of mesomorphism by using bulky groups instead of long alkyl chains.

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