Authors: | Schulte, Thorben R. Holstein, Julian J. Schneider, Laura Adam, Abdulselam Haberhauer, Gebhard Clever, Guido H. |
Title: | A new mechanically-interlocked [Pd2L4] cage motif by dimerization of two peptide-based lemniscates |
Other Titles: | in memory of Professor Carsten Schmuck |
Language (ISO): | en |
Abstract: | Most metallo-supramolecular assemblies of low nuclearity adopt simple topologies, with bridging ligands spanning neighboring metal centers in a direct fashion. Here we contribute a new structural motif to the family of host compounds with low metal count (two) that consists of a pair of doubly-interlocked, figure-eight-shaped subunits, also termed “lemniscates”. Each metal is chelated by two chiral bidentate ligands, composed of a peptidic macrocycle that resembles a natural product with two pyridyl-terminated arms. DFT calculation results suggest that dimerization of the mononuclear halves is driven by a combination of 1) Coulomb interaction with a central anion, 2) π-stacking between intertwined ligand arms and 3) dispersive interactions between the structure’s compact inner core bedded into an outer shell composed of the cavitand-type macrocycles. The resulting cage-like architecture was characterized by NMR, MS and X-ray structure analyses. This new mechanically bonded system highlights the scope of structural variety accessible in metal-mediated self-assemblies composed of only a few constituents. |
Subject Headings: | Supramolecular chemistry Cage motif Lemniscates Chiral ligands |
URI: | http://hdl.handle.net/2003/39792 http://dx.doi.org/10.17877/DE290R-21683 |
Issue Date: | 2020-08-26 |
Rights link: | https://creativecommons.org/licenses/by/4.0/ |
Appears in Collections: | Lehrstühle für Anorganische Chemie |
Files in This Item:
File | Description | Size | Format | |
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anie.202010995-final.pdf | 2.39 MB | Adobe PDF | View/Open |
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