Fig. 9From: Emerging functional materials based on chemically designed molecular recognitionReproduced from Ref. [102] with permission from 2016 the American Association for the Advancement of ScienceCatalysis using a molecular knot. a Catalytic hydrolysis of Ph2CHBr. b Allosterically initiated catalysis of Michael addition and Diels–Alder reactions by in situ generation of a trityl cation via bromide abstraction using Zn(II)–pentafoil knot [Zn52](BF4)10.Back to article page