Supramolecular Dynamics of Cyclic [6]Paraphenyleneacetylene Complexes with [60]‐ and [70]Fullerene Derivatives: Electronic and Structural Effects on Complexation

Stable inclusion complexes are formed between a carbon nanoring and C70 as well as methano[70]fullerene derivatives. 1H NMR spectroscopic studies show that at low temperatures the guest molecules are situated either above or below the center of the cavity. The presence of the bulky ester groups results in the interconversion between the complexes (see scheme, ΔG≠ ≈ 11.0 kcal mol−1) being faster than decomplexation.