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Optimized ion pair structures of (A) [P6,6,6,14]Cl and (B) [P6,6,6,14][NTF2] ion pairs determined from quantum chemical calculations. Reproduced with permission from ref (144). Copyright 2011 Royal Society of Chemistry. (C) Optimized [P4,4,4,8][BOB] ion pair structure obtained from DFT calculations. Reproduced with permission from ref (164). Copyright 2014 American Chemical Society.
