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Theoretical studies of the vibrational frequencies of C6n2H6n (n=2–12) coronenes, show that, despite full conjugation, delocalization and aromaticity, the stability of the planar geometry rapidly decreases with size. A switch to a nonplanar geometry can be expected at around n=9–12; any larger gas-phase coronene, including graphene, should be nonplanar. When applied to coronenes, popular quantum chemical...
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