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The Structure of a Seven-Bladed Propeller: C7Ph7+ is Not Planar
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1998
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Inorganic ChemistrySeven-bladed PropellerCrystal StructureEngineeringSingle-crystal X-ray DiffractionBiochemistryAerospace EngineeringPeripheral Phenyl SubstituentsNatural SciencesStructure ElucidationFree Tropylium CationOrganic ChemistryMain Group ChemistryPropulsionChemistryCrystallographyCrystal Structure Design
The first nondisordered structure of a free tropylium cation has been unequivocally determined by single-crystal X-ray diffraction. The solid-state structure of the heptaphenylcycloheptatrienyl cation, C7Ph7+, in [C7Ph7+][CF3CO2−]⋅2 CF3CO2H reveals a severely crowded system in which the central ring is nonplanar, and the propeller blades (the peripheral phenyl substituents) are arranged in a slightly tilted fashion about the seven-membered ring (right).