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Self-assembly of cucurbiturils and cyclodextrins to supramolecular millstones with naphthalene derivatives capable of translocations in the host cavities

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Abstract

Quaternary 4-(2-naphthyl)pyridinium salts with various N-substituents were synthesized. The structure of these salts was determined by X-ray crystallography. The self-assembly of the salts with cavitand molecules – β- and γ-cyclodextrins and cucurbit[7,8]urils – in aqueous solutions was studied by electronic spectroscopy and 1H NMR spectroscopy, including spectrophotometric, fluorescence, and 1H NMR titrations. The formation of inclusion complexes of different stoichiometry and stability, was observed, depending on the structure of N-substituent in the quaternary salt and the cavitand nature and cavity size. The complex formation with cucurbiturils results in considerable changes in the absorption and fluorescence spectra of naphthylpyridine derivatives. Motion of the guest molecules in the cavitand cavities was detected. The X-ray diffraction study was carried out for two polymorphs of 2 : 1 complexes formed by betaine type naphthylpyridine and cucurbit[8]uril, in which the cavitand was located either above the naphthalene residues of a dimeric pair of guest molecules or above the centers of their conjugated moieties.

Graphical abstract: Self-assembly of cucurbiturils and cyclodextrins to supramolecular millstones with naphthalene derivatives capable of translocations in the host cavities

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Publication details

The article was received on 14 Sep 2018, accepted on 22 Jan 2019 and first published on 23 Jan 2019


Article type: Paper
DOI: 10.1039/C8NJ04685A
Citation: New J. Chem., 2019, Advance Article

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    Self-assembly of cucurbiturils and cyclodextrins to supramolecular millstones with naphthalene derivatives capable of translocations in the host cavities

    A. I. Vedernikov, N. A. Lobova, L. G. Kuz’mina, M. V. Fomina, Y. A. Strelenko, J. A. K. Howard and S. P. Gromov, New J. Chem., 2019, Advance Article , DOI: 10.1039/C8NJ04685A

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