Issue 14, 2012

Bismuth 2,6-pyridinedicarboxylates: Assembly of molecular units into coordination polymers, CO2sorption and photoluminescence

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

Supplementary files

Article information

Article type
Paper
Submitted
02 Dec 2011
Accepted
14 Feb 2012
First published
29 Feb 2012

Dalton Trans., 2012,41, 4126-4134

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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