Controlled self-assembly of π-stacked/H-bonded 1D crystal structures from polyfluorinated arylamines and 18-crown-6 (2: 1). Associate: Vs. co-former fluorescence properties

Tamara A. Vaganova, Yurij V. Gatilov, Denis P. Pishchur, Igor P. Chuikov, Evgenij V. Malykhin

Результат исследования: Научные публикации в периодических изданияхстатья

5 Цитирования (Scopus)

Аннотация

Supramolecular 1D assemblies supported by N-H⋯Ocr and π-stacking interactions were designed and synthesized using polyfluorinated arylamines, differing in the nature of the aromatic ring (benzene, naphthalene, pyridine) and para-substituents (H, F, CN, CF3), and 18-crown-6 ether. Co-crystal structures and intermolecular interactions were studied in detail using X-ray analysis and compared with those in individual arylamine crystals. In the co-crystals, all relatively weak H-bonds N-H⋯X (X = F, Nhet, Ncyano) are replaced by the stronger bond N-H⋯Ocrown and π-stacking in pairs of the arylamine molecules is realized. Depending on the arylamine structure, a parallel displaced, rotated, or slipped stack geometry occurs. Using DSC, phase transitions in the co-crystals were determined and the thermal characteristics were found to be reproduced in the melting-crystallization cycles, which indicates the regeneration of the crystal structure. For a number of compounds, there are significant changes in the fluorescence characteristics, in terms of both intensity and wavelength, due to the formation of associates with 18-crown-6: aggregation-induced emission in the pentafluoroaniline associate, a large shift of λem in the 4-cyanotetrafluoroaniline associate, and aggregation-caused quenching in the 4-aminotetrafluoropyridine associate. Crystal structure analysis reveals that π-stacking interactions between arylamines play a key role in the modulation of the solid-state fluorescence properties. The revealed effect of fluorescence build-up/quenching shows these types of supramolecular associates to be promising solid-state chemosensors.

Язык оригиналаанглийский
Страницы (с-по)807-817
Число страниц11
ЖурналCrystEngComm
Том20
Номер выпуска6
DOI
СостояниеОпубликовано - 7 фев 2018

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