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Issue 32, 2015
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Synthetic, structural, and luminescence study of uranyl coordination polymers containing chelating terpyridine and trispyridyltriazine ligands

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Abstract

Seven uranyl coordination polymers [(UO2)(BrC8H3O4)(C15H11N3)] (1), [(UO2)(ClC8H3O4)(C15H11N3)] (2), [(UO2)(BrC8H3O4)(C18H12N6)]·H2O (3), [(UO2)(ClC8H3O4)(C18H12N6)]·2H2O (4), [(UO2)(C8H3IO4)(C18H12N6)]·2C3H7O (5), [(UO2)(C9H6O4)(C18H12N6)]·H2O (6), and [(UO2)(C6H2O4S)(C18H12N6)]·2H2O (7) containing N-donor ligands 2,2′:6′,2′′-terpyridine (TPY) and 2,4,6-tripyridyl s-triazine (TPTZ); and O-donor linkers thiophene 2,5-dicarboxylic acid (TDC) and X-1,4-benzene dicarboxylic acid (X-BDC, where X = Me, Cl, Br, I) were synthesized and characterized using single crystal X-ray diffraction (SC-XRD), powder X-ray diffraction (PXRD), and fluorescence spectroscopy. Each compound crystallizes as binuclear pseudo dimers containing a UO22+ pentagonal bipyramidal primary building unit. Fluorescence spectra of 1–4, and 6–7 show characteristic UO22+ emission whereas 5 is non-emissive. Red shifts within the emission of 1–4 are noted as a function of N-donor ligands TPY and TPTZ whereas emission shifts are not observed in TPTZ bearing compounds (3, 4, 6, 7) containing different O-donor linkers. Luminescent lifetimes of 1–7 were obtained and fitted with either bi-exponential or tri-exponential components.

Graphical abstract: Synthetic, structural, and luminescence study of uranyl coordination polymers containing chelating terpyridine and trispyridyltriazine ligands

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The article was received on 21 May 2015, accepted on 10 Jul 2015 and first published on 13 Jul 2015


Article type: Paper
DOI: 10.1039/C5CE00984G
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Citation: CrystEngComm, 2015,17, 6236-6247
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    Synthetic, structural, and luminescence study of uranyl coordination polymers containing chelating terpyridine and trispyridyltriazine ligands

    S. G. Thangavelu, S. J. A. Pope and C. L. Cahill, CrystEngComm, 2015, 17, 6236
    DOI: 10.1039/C5CE00984G

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