Affiliation:
1. School of Materials Science and Engineering University of Jinan Jinan 250022 China
2. College of Chemistry and Chemical Engineering Qingdao University Qingdao 266071 China
3. State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China
Abstract
AbstractFlexible organic crystal materials with optical waveguide property have attracted much attention for various applications. Meanwhile, the rising demand for deep space and polar explorations have brought about a growing interest in materials with low temperature flexibility. However, the development of organic crystal materials integrating optical waveguide and low temperature elasticity remains a significant challenge. Here, three flexible organic crystals with bromo‐hydroxy chalcone backbone are developed via molecular engineering strategy. The 4BHIE crystal with 4‐bromo‐N‐ethyl substituent exhibits superior 2D elasticity under mechanical external forces with ≈180° bending and 1.30 mm of curvature. The low optical loss coefficient of only 0.309 dB mm−1 also demonstrates potential applications in flexible optoelectronic waveguides. Interestingly, the introduction of a longer alkyl chain onto N atom of indole moiety (4BHIB) exhibits more remarkable flexibility with 0.35 mm of curvature due to its richer and more complex network of intermolecular interactions compared with that of 4BHIE. Furthermore, 5BHIE crystal with 5‐bromo‐N‐ethyl substituent shows not only elasticity at room temperature but also low‐temperature elasticity in liquid nitrogen with reversible temperature response owing to the strengthening intermolecular interactions at low temperature. 5BHIE crystal displays potential optical waveguide application in low temperature environments.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province