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Nearly 22 Å in diameter, bismacrocycle 2 is the largest known substructure of any network. This molecule and macrocycle 1 represent the first examples of subunits of graphdiyne, the most stable diacetylenic carbon allotrope comprising sp and sp2 hybridized carbons. Spectroscopic evidence suggests that the dehydro18annulene core of 1 and 2 retains its diatropic character.
Haley et al. (1997) studied this question.
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