Elastic Flexibility in an Optically Active Naphthalidenimine-Based Single Crystal

Organic single crystals that combine mechanical flexibility and optical properties are important for developing flexible optical devices, but examples of such crystals remain scarce. Both mechanical flexibility and optical activity depend on the underlying crystal packing and the nature of the inter...

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Bibliographic Details
Published in:Crystals (Basel) 2021-11, Vol.11 (11), p.1397
Main Authors: Feiler, Torvid, Michalchuk, Adam A. L., Schröder, Vincent, List-Kratochvil, Emil, Emmerling, Franziska, Bhattacharya, Biswajit
Format: Article
Language:English
Subjects:
Chlorine
crystal engineering
Crystal structure
Elastic bending
elastic crystal
Experiments
Flexibility
Hydrogen
Mechanical properties
mechanical property
molecular crystal
Naphthalene
Optical activity
Optical properties
Organic chemistry
Polymorphism
Radiation
Single crystals
Spectrum analysis
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Summary:Organic single crystals that combine mechanical flexibility and optical properties are important for developing flexible optical devices, but examples of such crystals remain scarce. Both mechanical flexibility and optical activity depend on the underlying crystal packing and the nature of the intermolecular interactions present in the solid state. Hence, both properties can be expected to be tunable by small chemical modifications to the organic molecule. By incorporating a chlorine atom, a reportedly mechanically flexible crystal of (E)-1-(4-bromo-phenyl)iminomethyl-2-hydroxyl-naphthalene (BPIN) produces (E)-1-(4-bromo-2-chloro-phenyl)iminomethyl-2-hydroxyl-naphthalene (BCPIN). BCPIN crystals show elastic bending similar to BPIN upon mechanical stress, but exhibit a remarkable difference in their optical properties as a result of the chemical modification to the backbone of the organic molecule. This work thus demonstrates that the optical properties and mechanical flexibility of molecular materials can, in principle, be tuned independently.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11111397