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Re-entrant supramolecular interactions in inverse-melting α-cyclodextrin·4-methylpyridine·water mixtures: an NMR study

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Abstract

Inverse melting α-cyclodextrin·4-methylpyridine·H2O ternary mixtures were studied via solution, high-resolution magic-angle-spinning and 2D-NOESY NMR spectroscopy with the aim of unveiling the supramolecular driving force for the unusual inverse-melting phase transition. The role of solvent–solvent interactions as well as solvent–solute interactions in the emergence of the inverse-melting phenomenon is revealed. A surprising re-entrant solvent–solvent interaction is found in the system and in the 4-methylpyridine·water solvent system, supporting the non-coincidental relationship between inverse melting and re-entrant phase transitions, at least in the present system.

Graphical abstract: Re-entrant supramolecular interactions in inverse-melting α-cyclodextrin·4-methylpyridine·water mixtures: an NMR study

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Publication details

The article was received on 09 Jul 2018, accepted on 19 Sep 2018 and first published on 20 Sep 2018


Article type: Paper
DOI: 10.1039/C8CP04328K
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Re-entrant supramolecular interactions in inverse-melting α-cyclodextrin·4-methylpyridine·water mixtures: an NMR study

    R. Shapira, Y. S. Balazs, S. Kababya, R. Edrei and Y. Eichen, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP04328K

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