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Issue 27, 2017
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Supramolecular networks in molecular complexes of pyridine boronic acids and polycarboxylic acids: synthesis, structural characterization and fluorescence properties

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Abstract

3- and 4-pyridineboronic acids have been combined with trimesic and pyromellitic acids to give three molecular complexes of compositions [(3PBAH+)(H2TMA)] (1), [(3PBAH+)2(H2PMA2−)] (2), and [(4PBAH+)2(H2PMA2−)]·2H2O (3) (3PBA = 3-pyridineboronic acid, 4PBA = 4-pyridineboronic acid, H3TMA = trimesic acid, H4PMA = pyromellitic acid). The products have been characterized by elemental analysis, infrared spectroscopy, single-crystal X-ray diffraction analysis and luminescence spectroscopy. The structural analysis revealed that the hydrogen bonding interactions of the resulting 2D and 3D assemblies involve at least one of the following charge-assisted synthons: –B(OH)2OOCR, RCOOH⋯OOCR or PyN+–H⋯OOCR. The dimensions are enhanced by additional hydrogen bonds as well as π–π stacking interactions, which include B⋯π interactions in two crystal structures. Intermolecular close contacts have also been examined by Hirshfeld surface analysis, which by means of the associated 2D fingerprint plots enabled similarities and differences in the crystal structures to be revealed. Solid-state photoluminescence spectroscopy of compounds 1–3 revealed that variations of the π–π stacking in the molecular aggregates induced changes in the emission behavior.

Graphical abstract: Supramolecular networks in molecular complexes of pyridine boronic acids and polycarboxylic acids: synthesis, structural characterization and fluorescence properties

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Publication details

The article was received on 22 Apr 2017, accepted on 05 Jun 2017 and first published on 05 Jun 2017


Article type: Paper
DOI: 10.1039/C7CE00762K
Citation: CrystEngComm, 2017,19, 3760-3775
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    Supramolecular networks in molecular complexes of pyridine boronic acids and polycarboxylic acids: synthesis, structural characterization and fluorescence properties

    J. J. Campos-Gaxiola, B. A. García-Grajeda, I. F. Hernández-Ahuactzi, J. A. Guerrero-Álvarez, H. Höpfl and A. Cruz-Enríquez, CrystEngComm, 2017, 19, 3760
    DOI: 10.1039/C7CE00762K

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