Trung Nguyen Thanh, Nhien Pham Quoc, Kim Cuc Tu Thi, Wu Chia-Hua, Buu Hue Bui Thi, Wu Judy I, Li Yaw-Kuen, Lin Hong-Cheu
Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan.
Department of Chemistry, College of Natural Sciences, Can Tho University, Can Tho City, Viet Nam.
ACS Appl Mater Interfaces. 2023 Mar 29;15(12):15353-15366. doi: 10.1021/acsami.2c21671. Epub 2023 Mar 16.
Bistable [2] daisy chain rotaxanes with respective extended and contracted forms of 2 and 2 containing a blue-emissive anthracene () donor and orange-emissive indandione-carbazole () acceptor were successfully synthesized via click reaction. Tunable-emission bistable [2] daisy chain rotaxanes with fluorescence changes from blue to orange, including bright-white-light emissions, could be modulated by the aggregation-induced emission (AIE) characteristics and Förster resonance energy transfer (FRET) processes through altering water fractions and shuttling processes (i.e., acid/base controls). Accordingly, as a result of excellent fine-tuning AIE (at 60% water content of HO/THF) and FRET (with a compatible energy transfer of = 33.2%) behaviors after the shuttling process (by adding base), the brightest white-light emission at CIE (0.31, 0.37) with a quantum yield of Φ = 15.64% was obtained in contracted 2 with good control of molecular shuttling to possess higher photoluminescence (PL) quantum yields and better energy transfer efficiencies (i.e., the manipulation of reduced PET and enhanced FRET processes) due to their intramolecular aggregations of blue donors and orange acceptors with a proper water content of 60% HO. Furthermore, dynamic light-scattering (DLS) and time-resolved photoluminescence (TRPL) measurements, along with theoretical calculations, were utilized to investigate and confirm AIE and FRET phenomena of bistable [2] daisy chain rotaxanes. Especially, both bistable [2] daisy chain rotaxanes 2 and 2 and noninterlocked monomer could be exploited for the applications of ratiometric fluorescence temperature sensing due to the temperature effects on the AIE and FRET features. Based on these desirable bistable [2] daisy chain rotaxane structures, this work provides a potential strategy for the future applications of tunable multicolor emission and ratiometric fluorescence temperature-sensing materials.
通过点击反应成功合成了具有2个扩展形式和2个收缩形式的双稳态[2]雏菊链状轮烷，其包含一个蓝色发光的蒽（）供体和橙色发光的茚二酮 - 咔唑（）受体。具有从蓝色到橙色荧光变化的可调发射双稳态[2]雏菊链状轮烷，包括亮白色光发射，可以通过聚集诱导发光（AIE）特性和福斯特共振能量转移（FRET）过程进行调节，通过改变水的比例和穿梭过程（即酸碱控制）。因此，由于在穿梭过程（通过添加碱）后具有出色的微调AIE（在HO/THF水含量为60%时）和FRET（具有33.2%的兼容能量转移）行为，在收缩的2中获得了CIE坐标为（0.31, 0.37）、量子产率为Φ = 15.64%的最亮白色光发射，通过对分子穿梭的良好控制，由于其蓝色供体和橙色受体在60% HO的适当水含量下的分子内聚集，具有更高的光致发光（PL）量子产率和更好的能量转移效率（即减少PET和增强FRET过程的操作）。此外，利用动态光散射（DLS）和时间分辨光致发光（TRPL）测量以及理论计算来研究和确认双稳态[2]雏菊链状轮烷的AIE和FRET现象。特别是，由于温度对AIE和FRET特征的影响，双稳态[2]雏菊链状轮烷2和2以及非互锁单体都可用于比率荧光温度传感应用。基于这些理想的双稳态[2]雏菊链状轮烷结构，这项工作为可调多色发射和比率荧光温度传感材料的未来应用提供了一种潜在策略。
