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Related Experiment Videos

Hg(II) Coordination Polymers Based on N,N'-bis(pyridine-4-yl)formamidine.

Wayne Hsu1, Xiang-Kai Yang2, Pradhumna Mahat Chhetri3

  • 1Department of Chemistry, Chung Yuan Christian University, Chung-Li 320, Taiwan, R. O. C.. wwffwayne@hotmail.com.

Polymers
|April 14, 2019
PubMed
Summary

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This study explores mercury coordination polymers using N,N′-bis(pyridine-4-yl)formamidine ligands. Different halide anions influence the structures, leading to diverse topologies and distinct luminescent and gas sorption properties.

Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • N,N′-bis(pyridine-4-yl)formamidine (4-Hpyf) is a versatile ligand for constructing coordination polymers.
  • Mercury(II) halides are suitable precursors for synthesizing novel coordination architectures.

Purpose of the Study:

  • To synthesize and characterize new mercury(II) coordination polymers using the 4-Hpyf ligand.
  • To investigate the influence of halide anions on the resulting structures and properties.
  • To explore the luminescent and gas sorption characteristics of the synthesized complexes.

Main Methods:

  • Single-crystal X-ray diffraction for structural characterization.
  • Density Functional Theory (DFT) calculations for emission mechanism analysis.
Keywords:
coordination polymerformamidinemercury

Related Experiment Videos

  • Gas sorption measurements for porous material evaluation.

    • Main Results:

    • Three mercury(II) complexes were synthesized: a 2D layer {[Hg(4-pyf)₂]·(THF)} (1) and helical chains {[HgX₂(4-Hpyf)]·(MeCN)} (X = Br, 2; I, 3).
    • Complexes exhibit distinct topologies (sql, helical chains) and supramolecular assemblies driven by hydrogen bonding.
    • DFT calculations revealed different emission mechanisms for complex 1 (intraligand) and complexes 2/3 (n→π* charge transfer).
    • Gas sorption properties of desolvated complex 1 were evaluated and compared to copper analogues, highlighting the role of counteranions and solvent-accessible volume.

    Conclusions:

    • Halide anions play a crucial role in dictating the folding/unfolding and dimensionality of mercury(II) coordination polymers.
    • The synthesized complexes display tunable luminescent properties based on their structure and composition.
    • The gas sorption capability is influenced by structural features such as counteranion type and pore size.