title: DABCO as a dynamic hinge between cofacial porphyrin panels and its tumbling inside a supramolecular cavity.
abstract: The heteroleptic supramolecular double-decker porphyrin 1 was synthesized with DABCO as a guest between two cofacial porphyrin units as characterized by (1)H NMR and ESI-MS. While DABCO is not seen to tumble inside the cavity, even at higher temperatures (80 °C), such motion was triggered upon addition of various coordinating ligands (quinuclidine, 4-bromopyridine, or excess of DABCO). Different stoichiometric amounts were needed depending on the n donor quality of the added ligands to initiate tumbling of the "inside" DABCO. As demonstrated in an example with excess DABCO, the tumbling was stopped by lowering the temperature to -50 °C.
authors.affiliation: Center for Micro- and Nanochemistry and Engineering, Organische Chemie I, Adolf-Reichwein Strasse, Universität Siegen, D-57068 Siegen, Germany.
authors.forename: Soumen K
authors.initials: SK
authors.lastname: Samanta
authors.forename: Debabrata
authors.initials: D
authors.lastname: Samanta
authors.forename: Jan W
authors.initials: JW
authors.lastname: Bats
authors.forename: Michael
authors.initials: M
authors.lastname: Schmittel
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D011166:Porphyrins / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D011166:Porphyrins