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Issue 14, 2012
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Bismuth 2,6-pyridinedicarboxylates: Assembly of molecular units into coordination polymers, CO2 sorption and photoluminescence

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Abstract

Six inorganic–organic bismuth 2,6-pyridinedicarboxylate (pdc) compounds, [Bi(2,6-pdc)3]·3(dma), 1, [Bi(2,6-pdc)3]·3(dma)·2(H2O), 2, [Bi(2,6-pdc)2(dmf)]·(dma), 3, Bi(2,6-pdc)(2,6-pdcme)(MeOH), 4, [LiBi(2,6-pdc)3(H2O)]·2(dma), 5, and Li5Bi(2,6-pdc)4(H2O)2, 6 (where dma = dimethyl ammonium cation, dmf = dimethylformamide and 2,6-pdcme = 6-methyl-oxycarbonyl pyridine 2-carboxylate) have been synthesized under solvothermal conditions and their structures determined by single crystal X-ray diffraction. Compounds 1–4 have molecular structures whereas compounds 5 and 6 form one- and three-dimensional frameworks, respectively. Compounds 1 and 2, both having similar monomeric bismuth coordination units, which are connected non-covalently into a (4,4)-connected square lattice by H-bonding interactions through dma cations. Compounds 3 and 4, both have a similar dimeric bismuth coordination unit. In 3, the dimers are connected into a one-dimensional chain by H-bonding interactions through dma cations. In the partially esterified and neutral 4, there was no such H-bonding interactions due to the absence of any dma cations. Compounds 5 and 6 have a similar monomeric bismuth coordination unit to that seen in 1 and 2. In 5, the monomers are connected through lithium cations into one-dimensional chains, which further interact non-covalently by H-bonding interactions through dma cations. In the lithium-rich 6, the monomers are connected by the lithium cations and 2,6-pdc anions into a three dimensional structure with intramolecular H-bonding interactions involving the water molecules. The non-porous 5 and 6 exhibit a reasonable amount of H2 and CO2 sorptions, respectively. Tb3+- and Eu3+-doped and co-doped 4 and 5 emit characteristic sensitized green/red/yellow-orange luminescence.

Graphical abstract: Bismuth 2,6-pyridinedicarboxylates: Assembly of molecular units into coordination polymers, CO2 sorption and photoluminescence

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Publication details

The article was received on 02 Dec 2011, accepted on 14 Feb 2012 and first published on 29 Feb 2012


Article type: Paper
DOI: 10.1039/C2DT12330D
Citation: Dalton Trans., 2012,41, 4126-4134

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    Bismuth 2,6-pyridinedicarboxylates: Assembly of molecular units into coordination polymers, CO2 sorption and photoluminescence

    A. Thirumurugan, W. Li and A. K. Cheetham, Dalton Trans., 2012, 41, 4126
    DOI: 10.1039/C2DT12330D

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