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Accommodative Behavior of Non-porous Molecular crystal at Solid-Gas and Solid-Liquid Interface.

Hemant M Mande1, Prasanna S Ghalsasi1

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Summary

This study introduces a novel dinuclear copper complex that reversibly interacts with HCl gas and azide anions. This molecular crystal exhibits crystal-to-crystal transformations for sensing applications.

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Area of Science:

  • Materials Science
  • Coordination Chemistry
  • Crystallography

Background:

  • Molecular crystals exhibit distinct solid-state and liquid-state behaviors due to structural differences.
  • Designing molecular compounds for dual solid-gas and solid-liquid interfaces is challenging.

Purpose of the Study:

  • To develop a non-porous molecular crystal with dual interface functionality.
  • To investigate reversible adsorption and accommodation of guest molecules through crystal transformations.

Main Methods:

  • Synthesis of a dinuclear copper complex: (C6H5CH(X)NH2)2CuCl2.
  • Characterization of solid-gas (HCl adsorption) and solid-liquid (azide anion accommodation) interactions.
  • Analysis of crystal-to-crystal transformations driven by molecular recognition and coordination sphere breathing.

Main Results:

  • The dinuclear copper complex reversibly adsorbs HCl gas at the solid-gas interface.
  • The complex accommodates azide anions at the solid-liquid interface via crystal-to-crystal transformation.
  • Coordination sphere breathing around the copper center facilitates guest molecule accommodation.
  • Observed transformations induce changes in optical, magnetic, and ferroelectric properties.

Conclusions:

  • The dinuclear copper complex exhibits unique reversible transformations at different interfaces.
  • The study provides principles for designing novel multifunctional molecular materials.
  • The material shows potential for diverse sensing applications due to its responsive properties.