A Schiff base derived from 2-thiouracil-4-aldehyde and dien reacts with CoII(CF3SO3)2 to afford a novel cyclic tetramer of cobalt(III) by self-assembly; the complex has a columnar cavity at its centre with an effective diameter of ca. 1.8 Å.
T. Kajiwara and T. Ito, J. Chem. Soc., Chem. Commun., 1994, 1773 DOI: 10.1039/C39940001773
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