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Dynamic covalent chemistry: A facile room temperature reversible Diels- Alder reaction between anthracene derivatives and N-phenyl-triazolinedione Abstract: Dr. N. Roy, Prof. J.-M. Lehn <strong>Laboratoire</strong> de Chimie Supramoléculaire, ISIS Universite´ de Strasbourg 8, allée Gaspard Monge 67000, Strasbourg (France) A series of readily accessible dynamic Diels-Alder reactions reversible at room temperature have been developed between anthracene derivatives as dienes and N-phenyl-1,2,4-triazoline- 3,5-di-one as dienophile. The adducts formed undergo reversible component exchange forming dynamic libraries of equilibrating cycloadducts. Furthermore, reversible adduct formation allows for temperature dependent modulation of the fluorescent properties of anthracene components, a feature of potential interest for the design of opto-dynamic polymeric materials by careful selection and manipulation of these simple dienes and dienophiles.
SUPRAMOLECULAR POLYMERS OF OLIGO-DYNAMERS Gaël Schaeffer & Jean-Marie Lehn <strong>Laboratoire</strong> de Chimie Supramoléculaire, ISIS, Université de Strasbourg, France lehn@isis.u-strasbg.fr Unlike traditional ones, supramolecular polymers are macromolecular entities where monomers are held together by noncovalent interactions. The labile nature of the interactions leads to dynamic properties for this type of polymers. Similarly it is possible to use reversible covalent bonds to obtain labile interactions between monomers (molecular dynamicity). One can thus define a group of polymers of different nature (supramolecular and molecular) displaying the same dynamic feature. These polymers, named dynamers, [1] display adaptive and exchange properties due to the lability of the interactions between their monomers. In the work presented here, we show that it is possible to design double dynamers where the molecular and supramolecular dynamicity are in a non-stoichiometric ratio. This has been achieved by the: - formation of oligomers where the monomers are held together by covalent reversible interactions - functionalization of the reactive end chains of these oligomers by hydrogen bonding units - connection of these functionalized oligomers by supramolecular interactions This leads to the formation of an entity that can be seen as a supramolecular polymer of molecular oligo-dynamers. It displays two types of dynamicity that are active on a different scale. The molecular dynamicity can be used for exchange at the monomeric level, whereas the supramolecular one acts on a larger scale by exchange of oligomeric blocks. [1] J.-M. Lehn, Prog. Pol. Sci., 2005, 30, 814-831
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4 th International Summer School Se
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4 th International Summer School
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Tuesday, September 13 th 9 - 10.30
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4.30 - 5.30 pm Poster Short Talks (
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2.30 - 4 pm Session VIII (Inorganic
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11.30 - 12.00 am Olga Federova, Mos
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INNOVATIVE DEVELOPMENTS ON THE BASI
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Calixarenes: from molecular recepto
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Controlled and Targeted Drug Delive
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What does the recognition of biomol
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Binding properties of calix[4]arene
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“Light and Molecular Design in Bi
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Supramolecular protein immobilizati
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Cucurbiturils at the interface betw
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Chiral Concave N-Heterocyclic Carbe
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