DABCO as a dynamic hinge between cofacial porphyrin panels and its tumbling inside a supramolecular cavity |
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Authors: | Samanta Soumen K Samanta Debabrata Bats Jan W Schmittel Michael |
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Institution: | Center for Micro- and Nanochemistry and Engineering, Organische Chemie I, Adolf-Reichwein Strasse, Universita?t Siegen, D-57068 Siegen, Germany. |
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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. |
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