Dynamic Isonicotinohydrazide Single Crystals With Tunable Properties via Mechanochemical Cocrystallization

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.