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Dynamic Isonicotinohydrazide Single Crystals With Tunable Properties via Mechanochemical Cocrystallization.

Nabadeep Kalita1, Pragyan J Hazarika2, Kalyan Jyoti Kalita3

  • 1Department of Chemistry, Gauhati University, Guwahati, Assam, India.

Chemistry, an Asian Journal
|March 18, 2026
PubMed
Summary

Researchers developed novel multi-component acylhydrazone crystals exhibiting tunable photoresponsive properties. This breakthrough offers new possibilities for advanced materials in electronics and sensing applications.

Keywords:
acylhydrazonedynamic crystalmechanochemistrymulti‐component crystalsolid‐state fluorescence

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Area of Science:

  • Materials Science
  • Crystallography
  • Photophysics

Background:

  • Multi-stimuli responsive materials with tunable photophysical properties are crucial for advanced applications like sensing, data security, displays, molecular actuators, soft robotics, and flexible electronics.
  • Acylhydrazone derivatives are known for their responsive properties, but their multi-component crystal behavior is underexplored.

Purpose of the Study:

  • To synthesize and characterize multi-component acylhydrazone derivatives, specifically crystal hydrates, cocrystal hydrates, and molecular salts.
  • To investigate the photoresponsive behavior of these novel multi-component crystals.
  • To establish structure-property relationships in substituted isonicotinohydrazide-based multi-component crystals.

Main Methods:

  • Synthesis of acylhydrazone derivatives and their multi-component forms (crystal hydrates, cocrystal hydrates, molecular salts) via mechanochemical methods.
  • Crystallographic analysis to determine the precise molecular arrangements and interactions within the crystals.
  • Computational modeling to understand electronic structure and predict photophysical properties.
  • Photophysical measurements to characterize the responsive behavior of the synthesized materials.

Main Results:

  • Successful synthesis of multi-component acylhydrazone derivatives exhibiting photoresponsive properties comparable to single-component crystals.
  • Demonstration of photoresponsive behavior in multi-component crystals, a rare phenomenon.
  • Elucidation of the structure-property relationships governing the photophysical behavior through integrated crystallographic, computational, and photophysical studies.

Conclusions:

  • Multi-component acylhydrazone crystals can exhibit tunable photoresponsive properties, similar to their single-component counterparts.
  • This study presents the first instance of photoresponsive behavior in multi-component acylhydrazone systems, highlighting a rare phenomenon in crystal engineering.
  • The findings pave the way for designing novel multi-component materials with tailored photophysical characteristics for diverse technological applications.