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Abstract <p>The reaction of dicarboxylate ligand, <i>cis</i>-4-cyclohexene-2-dicarboxylic acid (H<sub>2</sub>ccdca), with Pb(II) in solvothermal condition resulted in the formation of a new coordination polymer (CP) i. e., [Pb(ccdca)]<sub><i>n</i></sub>. Single crystal X-ray study reveals that this coordination polymer features a two-dimensional network whereas ccdca<sup>2–</sup> anions adopt their carboxylate groups to link with five neighboring Pb centers in µ<sub>1</sub>:η<sup>1</sup>:η<sup>1</sup> and µ<sub>3</sub>:η<sup>2</sup>:η<sup>1</sup> coordination modes. The ccdca<sup>2–</sup> ligands display <i>trans</i>-conformation and link with Pb centers to form an interesting 4,4-connected topological network with point symbol of {4<sup>3</sup>·6<sup>3</sup>}. In addition, the photoluminescent spectra indicate that free H<sub>2</sub>ccdca ligand and [Pb(ccdca)]<sub><i>n</i></sub> exhibit the emission maxima at 412 and 512 nm and emit blue and green luminescence at room temperature, respectively. Compound [Pb(ccdca)]<sub><i>n</i></sub> displays a red-shift of 100 nm in emission by comparison with free H<sub>2</sub>ccdca ligand, with enhanced emission band, which is attributed to the chelation of ligand to the Pb(II), increasing rigidity and reducing energy loss via nonradiative decay in the excited state.</p>

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Synthesis, Structure, and Fluorescence Property of a Lead Two-dimensional Coordination Polymer Constructed by Cyclohexenedicarboxylate Ligand

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Y.-T. Guo,
  • Y. Wang,
  • L. Guan,
  • H.-Z. Jin,
  • D. Zhao,
  • Y.-X. Li,
  • X.-Y. Hao

摘要

Abstract

The reaction of dicarboxylate ligand, cis-4-cyclohexene-2-dicarboxylic acid (H2ccdca), with Pb(II) in solvothermal condition resulted in the formation of a new coordination polymer (CP) i. e., [Pb(ccdca)]n. Single crystal X-ray study reveals that this coordination polymer features a two-dimensional network whereas ccdca2– anions adopt their carboxylate groups to link with five neighboring Pb centers in µ1:η1:η1 and µ3:η2:η1 coordination modes. The ccdca2– ligands display trans-conformation and link with Pb centers to form an interesting 4,4-connected topological network with point symbol of {43·63}. In addition, the photoluminescent spectra indicate that free H2ccdca ligand and [Pb(ccdca)]n exhibit the emission maxima at 412 and 512 nm and emit blue and green luminescence at room temperature, respectively. Compound [Pb(ccdca)]n displays a red-shift of 100 nm in emission by comparison with free H2ccdca ligand, with enhanced emission band, which is attributed to the chelation of ligand to the Pb(II), increasing rigidity and reducing energy loss via nonradiative decay in the excited state.