Self-assembled organic nonlinear optical crystals based on pyridine derived fluorenone. (17th January 2023)

• Record Type: Journal Article
• Authors: Zheng, Yongshen; Cheng, Puxin; Qian, Xiaodong; Guan, Junjie; Shi, Rongchao; Xin, Mingyang; Xu, Jialiang; Bu, Xian-He
• Is Part Of: Materials chemistry frontiers. Volume 7:Number 4(2023)
• Page Start: 698
• Page End: 704
• Publication Date: 2023-01-17
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/d2qm01173e
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : A pair of pyridine based fluorenone derivatives with highly efficient second- and third-order nonlinear optical effects have been synthesized. Abstract : Organic π-conjugated materials have demonstrated superior nonlinear optical (NLO) performance and serve as ideal candidates for photonic devices. However, the design of organic NLO materials with well-defined architectures and highly efficient second-order NLO properties remains a significant challenge. Here, pyridine groups with different N-substitution positions have been incorporated into the fluorenone skeleton to obtain target compounds 3-DPyFO and 4-DPyFO with modulated intermolecular interactions and self-assembly behaviors. Noncentrosymmetric 3-DPyFO-α exhibits thermal-induced phase transition and unusual multi-response fluorescence including thermochromic and mechanochromic luminescence. Meanwhile, 4-DPyFO-α shows highly efficient second- and third-order NLO effects, along with a resonance enhancement of second harmonic generation (SHG) and two-photon excited fluorescence (TPF). This study on NLO properties of pyridine functionalized fluorenone derivatives will enrich the fluorenone based NLO materials for photonic device applications.