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Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
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Noncovalent bonding assessment by pair distribution function.

Lucy K Saunders1, Daniel Irving1, Philip A Chater1

  • 1Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK. maria.diaz-lopez@neel.cnrs.fr.

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|May 9, 2023
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Summary
This summary is machine-generated.

This study uses X-ray pair distribution function analysis to precisely measure local structural changes in 4,4'-bipyridinium squarate (BIPY:SQA) during a temperature-induced transition, revealing insights into noncovalent bonding effects in materials.

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Area of Science:

  • Materials Science
  • Crystallography
  • Chemical Physics

Background:

  • Noncovalent interactions are crucial for material properties but difficult to study in disordered systems.
  • Conventional X-ray diffraction struggles with nanocrystalline, poorly crystalline, or amorphous materials lacking long-range order.

Purpose of the Study:

  • To accurately determine local structural deviations and aromatic ring tilting during a phase transition in 4,4 : 1 adduct of 4,4 : '-bipyridinium squarate (BIPY:SQA).
  • To demonstrate the utility of X-ray pair distribution function (PDF) analysis for understanding noncovalent bonding effects in materials.

Main Methods:

  • X-ray pair distribution function (PDF) analysis was employed.
  • The study focused on the temperature-induced first-order structural transition of BIPY:SQA from its low-temperature form (HAZFAP01) to its high-temperature form (HAZFAP07).

Main Results:

  • Accurate determination of local structural deviations and aromatic ring tilting during the phase transition.
  • Demonstrated the capability of PDF analysis to capture subtle structural changes in response to temperature variations.

Conclusions:

  • Pair distribution function analysis significantly enhances the understanding of local structural variations driven by noncovalent bonds.
  • This methodology can guide the design and development of new functional materials by elucidating structure-property relationships.