π-Conjugated cyclic porphyrin oligomers (porphyrin nanorings) with butadiyne linkers have been investigated extensively to probe cooperativity in multivalent molecular recognition, 2 extend the size limits of aromaticity 3 and provide models for ultrafast energy migration in photosynthetic light-harvesting systems. Accurate crystallographic molecular geometries are valuable for analyzing host-guest interactions, and for understanding aromaticity, 5 yet little is known about how porphyrin nanorings behave in the solid state. Porous organic frameworks are widely investigated for applications such as gas storage and sensing, 8 and many macrocycles have been reported to form porous crystals, 9 which suggests that porphyrin nanorings might exhibit this type of behavior.