Synthesis and functional properties of organic giant macrocycles containing star-shaped conjugated molecules

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We synthesized three giant conjugated macrocyclic systems, i.e., giant macrocyclic pentadecaphenylenes, giant macrocyclic oligothiophenes, and trinuclear tropolone‒palladium(II) macrocycles. These molecules incorporated C60 in solution and in the solid state to form 1:1 and 1:2 inclusion complexes. From a viewpoint of electronic communications, fullerenes can be regarded as a star-like conjugated network, and therefore, we studied electronic interactions either between fullerenes and giant conjugated macrocyclic systems or between constituents of giant conjugated macrocyclic systems via fullerenes. As a result, we found unique charge-transfer interactions between fullerenes and giant conjugated macrocyclic systems, together with photo-induced electric conductivity of C60-incorporated macrocyclic oligothiophenes.