Large “Pillow” Fullerenes Hydrogenated at the Inter-sheet “Seam”

In a previous paper on large “pillow” fullerenes, various systems were described with 12 pentagons connecting 2 parallel hexagonal arrays of benzenoid rings (graphene fragments functioning as the faces of the “pillow”) on top of each other. Additional bonds between these identical arrays formed only from sphybridized carbon atoms gave rise to hexagons and 12 pentagons along the “seam” or “rim.” High steric strain was associated with curvature around the pentagons due to connections between the 2 pillow faces involving bonds between 2 sp-hybridized carbon atoms. The present paper examines similar “quasi-graphitic” structures in which some carbon atoms of the rim between the two raphene faces have hydrogen atoms attached to them, i.e., have sp-hybridization, alleviating thereby some strain.