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Polymorphism and Negative Linear Compressibility in Pyrazine-d4.

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Researchers discovered a new low-temperature phase in pyrazine, a key material in advanced crystals. This transition, driven by subtle C-H···N bonds, reveals unique pressure-temperature behaviors and negative linear compressibility in molecular solids.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Pyrazine (1,4-diazine) is a crucial linker in coordination polymers, molecular magnets, and metal-organic frameworks.
  • Solid-state polymorphism in pyrazine is governed by weak C-H···N interactions.

Purpose of the Study:

  • To investigate the low-temperature and high-pressure polymorphism of pyrazine.
  • To understand the role of C-H···N interactions in phase transitions and mechanical responses.

Main Methods:

  • Variable-temperature neutron diffraction
  • High-pressure neutron diffraction
  • Structural analysis of crystal phases

Main Results:

  • A previously unrecognized low-temperature transition to phase IV was identified below ~90 K.
  • The pressure-stabilized phase can be accessed at low temperatures at ambient pressure in perdeuterated pyrazine.
  • The III → IV transition involves symmetry breaking, driven by C-H···N bond reorganization and negative linear compressibility.
  • Distinct hydrogen-bonded network evolution occurs depending on temperature or pressure pathways.

Conclusions:

  • Pyrazine serves as a model system for studying pressure-temperature polymorphism.
  • Weak directional interactions can induce anomalous mechanical responses in organic crystals.