Selenacalix[4]dithienothiophene: Synthesis,Structure, and Complexation of a Cyclic Tetramer of Selenide‐Bridging Dithienothiophene

An efficient cyclization toward a cyclic tetramer of dithienothiophene (DTT) linked by divalent selenium atoms has been developed via palladium‐catalyzed coupling reaction of (nBu₃Sn)₂Se. X‐ray analysis revealed its highly symmetrical structure had an alternate arrangement of DTT units. There are several Se???π interactions forming a supramolecular network leading to large void channel space. The cyclic tetramer possesses moderate electron‐donating ability. Furthermore, the cyclic tetramer undergoes complexation with C₆₀ in a 1:2 ratio in the solid state to give a highly symmetrical three‐dimensional array of C₆₀.