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Optimizing the formation of 2,6-bis(N-alkyl-benzimidazolyl)pyridine-containing [3]catenates through component design
The 2,6-bis(N-alkyl-benzimidazolyl)pyridine (Bip) ligand has been utilized to access mechanically interlocked [3]catenanes viametal-templating. Components containing the Bip ligand, namely macrocycles and linear threads, were designed to self-assemble upon the addition of transition metal ions into...
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Published in: | Chemical science (Cambridge) 2013-01, Vol.4 (12), p.4440-4448 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The 2,6-bis(N-alkyl-benzimidazolyl)pyridine (Bip) ligand has been utilized to access mechanically interlocked [3]catenanes viametal-templating. Components containing the Bip ligand, namely macrocycles and linear threads, were designed to self-assemble upon the addition of transition metal ions into [3]metallopseudorotaxanes that require a single olefin metathesis reaction to yield the [3]catenate. Utilizing two-dimensional diffusion-ordered NMR spectroscopy (DOSY) the crude reaction mixture resulting from the ring-closing reaction of this template was studied. It was shown that the yield of the [3]catenates was dependent on the preorganization and conformational flexibility of the thread-like component and the size of the N-alkyl substituents on the Bip in the macrocyclic component. Through judicious design of both components the resulting reaction distribution can be altered to predominantly favour the formation of the [3]catenate. Furthermore, after de-metalation and purification the resulting [3]catenanes were fully characterized by a variety of NMR and mass spectroscopy techniques. |
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ISSN: | 2041-6520 2041-6539 |
DOI: | 10.1039/c3sc52082j |