title: Caterpillar Track Complexes in Template-Directed Synthesis and Correlated Molecular Motion.
abstract: Small alterations to the structure of a star-shaped template totally change its mode of operation. The hexapyridyl template directs the conversion of a porphyrin dimer to the cyclic hexamer, but deleting one pyridine site changes the product to the cyclic decamer, while deleting two binding sites changes the product to the cyclic octamer. This surprising switch in selectivity is explained by the formation of 2:1 caterpillar track complexes, in which two template wheels bind inside the nanoring. Caterpillar track complexes can also be prepared by binding the hexapyridyl template inside the 8- and 10-porphyrin nanorings. NMR exchange spectroscopy (EXSY) experiments show that these complexes exhibit correlated motion, in which the conrotatory rotation of the two template wheels is coupled to rotation of the nanoring track. In the case of the 10-porphyrin system, the correlated motion can be locked by binding palladium(II) dichloride between the two templates.
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Shiqi
authors.initials: S
authors.lastname: Liu
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Kondratuk
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Sophie A L
authors.initials: SA
authors.lastname: Rousseaux
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Guzmán
authors.initials: G
authors.lastname: Gil-Ramírez
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Melanie C
authors.initials: MC
authors.lastname: O'Sullivan
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Jonathan
authors.initials: J
authors.lastname: Cremers
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Tim D W
authors.initials: TD
authors.lastname: Claridge
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, OX1 3TA (UK).
authors.forename: Harry L
authors.initials: HL
authors.lastname: Anderson
keywords: Molekulare Bewegung; Molekulare Zahnräder; Porphyrinoide; Supramolekulare Chemie; Templatsynthesen