In conclusion, we have demonstrated the ability of butadiynelinked six-porphyrin rings to form hexagonal arrays and fullerene cocrystals in the solid state, as evident from single crystal X-ray diffraction analysis. We showed that tubular stacks can be formed in the solid state, simply by the crystal packing and interdigitating of the aryl groups of the rings. It is remarkable that the nanoring template complex was found to form four structurally characterized pseudopolymorphs with drastically different solid-state packing, with up to four crystallographically independent molecules in the same structure and varying porosity. This reflects how subtle differences in molecular geometry and crystallization conditions influence the global features of the crystal structure. The observed conformers show varying degrees of porphyrin planarity and bending of the linkers. This is an important insight for the design of large, conjugated molecules. It shows that these π-conjugated molecules are shape-persistent, yet surprisingly flexible; the most drastic example being the elliptical geometry of the free-base nanoring co-crystallized with C60. Porphyrin nanorings combine the flexibility of the individual porphyrin subunits 29 and butadiyne linkers. It will be interesting to build on the work presented here to study light harvesting and energy migration in crystal lattices of nanorings.