Cycling a Tether into Multiple Rings: Pt-Bridged Macrocycles for Differentiated Guest Recognition,Pseudorotaxane Transformations,and Guest Capture and Release |
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Authors: | Dr Miguel A Soto Dr Veronica Carta Ingrid Suzana Dr Brian O Patrick Prof Francesco Lelj Prof Mark J MacLachlan |
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Institution: | 1. Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1 Canada;2. La.M.I. and LaSCAMM INSTM Sezione Basilicata, Dipartimento di Chimica, Università della Basilicata, via dell'Ateneo Lucano 10, 85100 Potenza, Italy |
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Abstract: | Macrocycle engineering is a key topic in supramolecular chemistry. When synthesizing a ring, one can obtain either complex mixtures of macrocycles of different sizes or a single ring if a template is utilized. Here, we unite these approaches along with post-synthetic modifications to transform a single tether into multiple rings—up to five per tether. The macrocycles contain two bridged phenylpyridine ligands that are connected through a Pt atom, which defines the rings’ shape, size, and host activity. All rings undergo redox reactions (between PtII and PtIV) that allow for large conformational changes. Their reactivity, together with their host performance, is a convenient way to control the capture and release of guests, to mediate ring transformations, and to control pseudorotaxane-to-pseudorotaxane conversions. This novel approach could serve to assemble other libraries of small ring molecules, create cyclic polymers bridged by responsive-at-metal nodes, and produce processable mechanically interlocked molecules. |
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Keywords: | Crown Ethers Host-Guest Chemistry Macrocycles Platinum Supramolecular Chemistry |
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