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Related Experiment Video

Updated: Jul 2, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

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Published on: April 14, 2020

Interaction Hierarchy and Polymorphic Structure-Property Dynamics in Luminescent Molecular Crystals.

Mahiro Nakabayashi¹, Shotaro Hayashi^1,2

¹School of Engineering Science, Kochi University of Technology, Kami, Kochi, Japan.

Angewandte Chemie (International Ed. in English)

|June 30, 2026

Summary

Researchers designed luminescent molecular crystals with tunable interactions. These crystals exhibit distinct phase transitions and emission color changes in response to stimuli, offering predictable control over solid-state switching behaviors.

Keywords:

crystal engineering intermolecular interactions polymorphs solid‐state phase transition stimulus responses

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Published on: April 14, 2020

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Area of Science:

Materials Science
Crystallography
Supramolecular Chemistry

Background:

Solid-state phase transitions are crucial for molecular-level control of macroscopic properties.
Predictable design strategies for solid-state phase transitions are currently limited.
Luminescent molecular crystals offer potential for functional responses through structural changes.

Purpose of the Study:

To investigate polymorphic structure-property switching in luminescent molecular crystals.
To explore the role of competing intermolecular interactions in controlling crystal structures and photoluminescence.
To develop rational design strategies for predictable solid-state phase transitions.

Main Methods:

Synthesis of cyano-β-substituted distyrylbenzene derivatives with bromo and methoxy side chains.
Single-crystal X-ray diffraction analysis to determine crystal structures and molecular packing.
Photophysical measurements (photoluminescence spectroscopy) to assess optical properties.
Thermal and mechanical stimuli to induce phase transitions.
Crystal framework calculations to elucidate kinetic and thermodynamic controls.

Main Results:

Competing homotypic and heterotypic noncovalent interactions led to distinct polymorphic crystal structures.
Subtle differences in interaction hierarchies influenced molecular orientation and photoluminescence.
Irreversible thermal and pseudo-reversible mechanical stimuli induced distinct phase transitions with visible emission color changes.
Demonstrated control over polymorph formation through kinetic and thermodynamic pathways.

Conclusions:

Multifunctional molecular side chains enable diverse interaction landscapes for encoded structure-property switching.
The study provides a framework for interpreting dynamic structural behaviors in molecular crystals.
This work advances the rational design of materials exhibiting predictable solid-state phase transitions and functional responses.