Huo Man, Song Shuang-Qi, Dai Xian-Yin, Li Fan-Fan, Hu Yu-Yang, Liu Yu
College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University Tianjin 300071 P. R. China
Chem Sci. 2024 Feb 26;15(14):5163-5173. doi: 10.1039/d4sc00160e. eCollection 2024 Apr 3.
Organic photoluminescent macrocyclic hosts have been widely advanced in many fields. Phosphorescent hosts with the ability to bind organic guests have rarely been reported. Herein, acyclic cucurbituril modified with four carboxylic acids (ACB-COOH) is mined to present uncommon purely organic room-temperature phosphorescence (RTP) at 510 nm with a lifetime of 1.86 μs. Its RTP properties are significantly promoted with an extended lifetime up to 2.12 s and considerable quantum yield of 6.29% after assembly with a polyvinyl alcohol (PVA) matrix. By virtue of the intrinsic self-crimping configuration of ACB-COOH, organic guests, including fluorescence dyes (Rhodamine B (RhB) and Pyronin Y (PyY)) and a drug molecule (morphine (Mor)), could be fully encapsulated by ACB-COOH to attain energy transfer involving phosphorescent acyclic cucurbituril. Ultimately, as-prepared systems are successfully exploited to establish multicolor afterglow materials and visible sensing of morphine. As an expansion of phosphorescent acyclic cucurbituril, the host afterglow color can be readily regulated by attaching different aromatic sidewalls. This study develops the fabrication strategies and application scope of a supramolecular phosphorescent host and opens up a new direction for the manufacture of intelligent long-lived luminescent materials.
有机光致发光大环主体在许多领域都得到了广泛的发展。具有结合有机客体能力的磷光主体很少被报道。在此，挖掘了用四种羧酸修饰的无环葫芦脲（ACB-COOH），其在510 nm处呈现出罕见的纯有机室温磷光（RTP），寿命为1.86 μs。与聚乙烯醇（PVA）基质组装后，其RTP性能得到显著提升，寿命延长至2.12 s，量子产率达到可观的6.29%。凭借ACB-COOH固有的自卷曲构型，包括荧光染料（罗丹明B（RhB）和吡啰红Y（PyY））以及药物分子（吗啡（Mor））在内的有机客体可以被ACB-COOH完全包封，从而实现涉及磷光无环葫芦脲的能量转移。最终，所制备的体系成功地用于制备多色余辉材料和对吗啡进行可视化传感。作为磷光无环葫芦脲的扩展，通过连接不同的芳香侧壁可以很容易地调节主体的余辉颜色。这项研究开发了超分子磷光主体的制备策略和应用范围，并为智能长寿命发光材料的制造开辟了新方向。
