Kou Ya-Lan, Tong Jin, Meng Cong, Yuan Qing, Wang Ji, Yu Shu-Yan
Laboratory for Self-Assembly Chemistry, Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.
ACS Appl Mater Interfaces. 2023 Aug 30;15(34):40828-40838. doi: 10.1021/acsami.3c07838. Epub 2023 Aug 19.
Luminescent supramolecular metallacycles have attracted great interest as a new promising class of sensing substrates. In this work, two tetraphenylethene (TPE)-based diimidazole and dipyrazole ligands with the aggregation-induced emission (AIE) feature were designed for the construction of supramolecular tetragonal metallacycles - with two 90° mononuclear [(bpy)M] or dinuclear [(bpy)M] acceptors (bpy = 2,2'-dipyridine; M = Pd, Pt), in which the fluorescence can be quenched to an "off" state due to the ligand-to-metal charge transfer (LMCT). Metallacycle was utilized as a fluorescence sensor for phosphate (PO) detection in aqueous solution by means of disassembly, leading to the release of the ligand. Additionally, the metallacycle can be regenerated through self-assembly via the introduction of Pd(II) acceptors. PO was detected using TPE-based metallacycles over a wide concentration range, with a detection limit as low as 2.1 × 10 M. Furthermore, sensor also presented the semiquantitative visual detection ability for PO in the test paper mode via fluorescence changes. The aforementioned studies not only enhance the current research on fluorescent materials but also offer a strategy for the creation of stimuli-responsive supramolecular coordination complexes.
发光超分子金属环作为一类新的有前途的传感底物引起了极大的兴趣。在这项工作中，设计了两种具有聚集诱导发光（AIE）特性的基于四苯乙烯（TPE）的二咪唑和二吡唑配体，用于构建超分子四方金属环，其中含有两个90°单核[(bpy)M]或双核[(bpy)M]受体（bpy = 2,2'-联吡啶；M = Pd，Pt），由于配体到金属的电荷转移（LMCT），其荧光可淬灭至“关闭”状态。金属环被用作荧光传感器，通过拆解用于水溶液中磷酸盐（PO）的检测，导致配体释放。此外，通过引入Pd(II)受体，金属环可通过自组装再生。基于TPE的金属环在很宽的浓度范围内检测PO，检测限低至2.1×10 M。此外，传感器还通过荧光变化在试纸模式下对PO具有半定量视觉检测能力。上述研究不仅加强了当前对荧光材料的研究，还为创建刺激响应超分子配位复合物提供了一种策略。
