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Mesomorphic Behavior in Silver(I)

Issac Torres1, Mauro Ruiz2, Hung Phan3

  • 1Department of Chemistry, University of Texas at El Paso, El Paso, TX 79968, USA. igtorres@miners.utep.edu.

Materials (Basel, Switzerland)
|September 13, 2018
PubMed
Summary

Researchers developed new silver(I) bis-N-(4-pyridyl) benzamide compounds that form π-π stacking networks. These materials exhibit mesomorphic behavior and low-band gap properties, suggesting potential for advanced organic electronics.

Keywords:
crystalline solidsmesomorphic materialsmetallo-mesogenssilver complexesπ–π stacking

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Solid-State Physics

Background:

  • Organic semiconductor materials are crucial for flexible electronics.
  • π-π stacking aromatic compounds are of significant interest for advanced technologies.

Purpose of the Study:

  • To synthesize and characterize a new family of silver(I) bis-N-(4-pyridyl) benzamide compounds with varying counterions.
  • To investigate the π-π stacking interactions, mesomorphic behavior, and electronic properties of these novel compounds.

Main Methods:

  • Synthesis of seven [Ag(NPBA)2]X compounds with different counterions (X = NO₃⁻, ClO₄⁻, CF₃SO₃⁻, PF₆⁻, BF₄⁻, CH₃PhSO₃⁻, PhSO₃⁻).
  • X-ray crystallography to analyze π-π stacking networks.
  • Atomic Force Microscopy (AFM) to study fiber formation.
  • Differential Scanning Calorimetry (DSC) for thermal analysis.
  • NRLMOL simulations for band gap calculations.

Main Results:

  • The compounds form extended π-π stacking networks in 1D, 2D, and 3D with an average inter-ring distance of 3.823 Å.
  • Counterions with π-π stacking groups induced mesomorphic phases at 130 °C in DMF, forming highly branched networks.
  • AFM revealed the formation of 2D interconnected fibers, suggesting potential for nanofiber synthesis.
  • Band gap simulations yielded values ranging from 1.48 eV to 5.08 eV, with several compounds exhibiting low-band gap properties.

Conclusions:

  • The synthesized silver(I) compounds display versatile π-π stacking capabilities and mesomorphic behavior.
  • The combination of mesomorphic properties and low-band gap characteristics in these materials opens avenues for developing next-generation highly branched organic semiconductors.