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Face centered cubic arrangement of [60]fullerene dodecaacids for frameworks a) HFF-1 [57], b) HFF-2 and c) HFF-3: ORTEP representation of fullerene monomers (top, thermal ellipsoids set to 50% probability, carbon grey, oxygen red, hydrogen atoms omitted for clarity), side view indicating ABC-type packing (center) and top view indicating enlarged intralayer spacing for elongated derivatives (bottom); images are created with PyMOL [58].
