A Tetrameric Macrocycle with 2,5-Dithio-1,3,4-thiadiazole Subunits

The centrosymmetric molecule 40<[OS(2,5)1,3,4-thiadiazolo, S]₄-coronand-16> (alternative name: 10,11,21,22,32,33,43,44-octaaza-5,16,27,38-tetraoxa-2,8,13,19,24,30,35,41,45,46,47,48-dodecathiapentacyclo[40.2.1.1^9,12,. 1^20,23.1^31,34]octatetracontane), C₂₄H₃₂N₈O₄S₁₂, has its 40-membered ring, in which no cavity exists, in an extended conformation, with its maximum dimension approximately three times its minimum. Linkage of one of the two independent thiadiazole rings to the remainder of the molecule is syn to nitrogen on both sides, with N-C-S-C torsion-angle magnitudes of 0.8 (3) and 13.6 (4)°. The other thiadiazole ring has one linkage syn to nitrogen and one anti to nitrogen, with torsion-angle magnitudes 31.3 (3) and 177.9 (3)°.

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