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Photoluminescent Ferroelastic Molecular Crystals
Tomohiro Seki1, Chi Feng1, Kentaro Kashiyama1
1Division of Applied Chemistry and Frontier Chemistry Center, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060-8628, Japan.
Angewandte Chemie (International Ed. in English)
|February 21, 2020
Summary
Researchers discovered the first ferroelastic luminescent organometallic crystals. These arylgold(I)(N-heterocyclic carbene) crystals bend under mechanical stress, showing ferroelastic behavior and light emission potential.
Area of Science:
- Materials Science
- Crystallography
- Organic Chemistry
Background:
- Ferroelasticity is observed in molecular crystals, characterized by stress-induced shape changes and strain.
- Combining ferroelasticity with luminescence in a single material is a key goal for advanced functional materials.
Purpose of the Study:
- To discover and characterize the first examples of ferroelastic luminescent organometallic crystals.
- To investigate the structural basis for ferroelastic behavior in these novel materials.
Main Methods:
- Synthesis of arylgold(I)(N-heterocyclic carbene) complexes.
- Mechanical stress application and observation of crystal bending.
- X-ray diffraction analysis to confirm crystal structure and ferroelastic behavior.
- Stress-strain measurements to quantify mechanical properties.
Main Results:
- Discovery of the first ferroelastic luminescent organometallic crystals based on gold-NHC complexes.
- Observed bending of crystals under anisotropic mechanical stress.
- Confirmed ferroelastic behavior, including mechanical twinning and spontaneous strain.
- Identified structural factors contributing to ferroelasticity through comparison with non-ferroelastic analogs.
Conclusions:
- Arylgold(I)(N-heterocyclic carbene) complexes represent a new class of materials exhibiting both ferroelasticity and luminescence.
- Understanding the structure-property relationships is crucial for designing future ferroelastic luminescent materials.
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