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Issue 24, 2017
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Intense greenish phosphorescence emission under ambient conditions in a two-dimensional lead(II) coordination polymer with a 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate ligand

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Abstract

In this study, a new two-dimensional Pb2+-based coordination polymer (CP), [Pb2(EBTC)(DMSO)3] (1), where H4EBTC is 1,1′-ethynebenzene 3,3′,5,5′-tetracarboxylic acid, was synthesized under solvothermal conditions. Structural analysis reveals that 1 crystallizes in the monoclinic space group C2/m, where two crystallographically different Pb2+ ions show a coordination geometry of bicapped trigonal prisms that are connected to a double-chain by the EBTC4− ligands through carboxylate groups along the b-axis direction, and where successive double chains are held together to form a 2D layer via the Pb1 and Pb2 bicapped trigonal prisms sharing one edge or a triangle face along the c-axis direction. Interestingly, CP 1 emitted intense and long-lived greenish phosphorescence in the solid state at ambient conditions, with a quantum yield of 1.5% and a phosphorescence lifetime of 4.17 ms, and the emission mainly arose from the electron transition within the π-type orbitals of the EBTC4− ligand. The emission bands assignment and photophysical process were further discussed according to the calculation of both the electronic band structures and density of states. This study gives a fresh impetus to achieve coordination polymer-based long-lived phosphorescence materials under ambient conditions.

Graphical abstract: Intense greenish phosphorescence emission under ambient conditions in a two-dimensional lead(ii) coordination polymer with a 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate ligand

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Publication details

The article was received on 04 May 2017, accepted on 27 May 2017 and first published on 29 May 2017


Article type: Paper
DOI: 10.1039/C7DT01626C
Citation: Dalton Trans., 2017,46, 7953-7959
  • Open access: Creative Commons BY license
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    Intense greenish phosphorescence emission under ambient conditions in a two-dimensional lead(II) coordination polymer with a 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate ligand

    X. Liu, L. Zhai, W. Zhang, J. Zuo, Z. Yang and X. Ren, Dalton Trans., 2017, 46, 7953
    DOI: 10.1039/C7DT01626C

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