Like with a string of pearls, four molecular "beads" are threaded on a molecular rectangle to form a molecular necklace. This rectangular species is synthesized from two L-shaped, preorganized pseudorotaxanes with two molecular beads each (cucurbituril, schematically symbolized by the barrels), held together by Cu ions [Eq. (1)].

Eine Perle der supramolekularen Art: Eine rechteckige molekulare „Perlenkette”︁ mit vier molekularen Perlen entsteht durch Umsetzung zweier L‐förmiger, je zwei molekulare Perlen (Cucurbituril, symbolisiert durch die Fässer) enthaltender Pseudorotaxane mit Cu2 +‐Ionen [Gl. (1)].

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