Enhanced Circularly Polarized Luminescence from Reorganized Chiral Emitters on the Skeleton of a Zeolitic Imidazolate Framework

Abstract

A chiral zeolitic imidazolate framework (ZIF) showing circularly polarized luminescence (CPL) has been successfully constructed by blending binapthyl‐derived chiral emitters with ZIF‐8 rhombic dodecahedron nanoparticles. This approach solves a major trade‐off in CPL‐active materials: the large luminescence dissymmetry factor (glum) always suffers from suppression of luminescence efficiency. Compared to the optical properties of chiral emitters, the obtained chiral ZIF nanomaterials showed an enhanced fluorescence efficiency while the |glum| value is significantly amplified by one order of magnitude. Additionally, enantioselective fluorescence sensing in response to α‐hydroxycarboxylic acids has been enhanced in chiral ZIFs. Reorganization and conjunction of chiral emitters to the skeleton of ZIF nanoparticles can greatly improve both the luminescence quantum yield and circularly polarization, which facilitates the design of more efficient chiroptical materials.

Mesoporous Crystalline Silver-Chalcogenolate Cluster-Assembled Material with Tailored Photoluminescence Properties

“…Although some effective strategies have been reported to achieve novel luminescence in metal-organic frameworks, [53][54][55][56][57] customizing luminescence in crystalline clusterassembled materials (CAMs) still presents a challenge. Favorably, the ultralarge pore diameter of 1 endows it with a potential to encapsulate some large functionalized guest molecules beside small solvent molecules, hence providing the possibility for tailoring its luminescence.…”

Optically Ambidextrous Reflection and Luminescence in Self-Organized Left-Handed Chiral Nematic Cellulose Nanocrystal Films

“…These observations are unprecedented as left-handed chiral nematic CNC films enable PBG-based RCP luminescence only due to the forbidden propagation of LCP luminescence. [54][55][56][57][58][59] CP luminescence spectra of CNC/PF-10BT-c-T and corresponding g lum values along with the transmission spectra showed systematic changes in the CP luminescence properties (Figure 4, Scheme 1). For example, a well-resolved RCP luminescence signal with |g lum | values up to 0.796 was observed for CNC/PF-10BT-4-4 prepared at low evaporation temperature and CNC suspension concentration (Figure 4a and 4b).…”

Design, Synthesis and Applications of Chiral Metal-Organic Frameworks

“…段鹏飞课题组 [66] 以 ZIF-8 为主体, 通过轴手性配体 联萘衍生物部分交换 2-甲基咪唑, 获得了具有优异 CPL 性能的手性金属-有机框架(图 8). 与轴手性配体联萘衍 生物的发光性能相比, 该手性金属-有机框架的不对称 因子从 7.0×10 -4 提高为 5.5×10 -3 , 荧光效率也从 0.3 增强至 0.4.…”