In this study, parallelogram-like macrocyclic supramolecular metallacycles [Pd₆(bpy)₆(L¹)₄](PF₆)₈ (1a) and [Pd₆(bpy)₆(L²)₄](PF₆)₈ (2a), where HL¹=1-(1H-pyrazole-4-yl)-4-(4-pyridyl)benzene, HL²=9-(1H-pyrazole-4-yl)-10-(4-pyridyl)anthracene, and bpy=2, 2'-bipyridine, are synthesized by reacting aryl pyrazole pyridine ligands with dipalla-dium corners in aqueous solutions via metal-directed hierarchical self-assembly. The structures of the supramolecular Pd parallelograms are confirmed through single-crystal X-ray diffraction. Notably, the two parallelogram metallacycles can be used as"turn-on"fluorescence sensors to detect HSO₃^- through a disassembly mechanism. In addition, the 1a-based sensor shows selective detection of HSO₃^- without interference from other anions. The detection limit was as low as 0.131 μmol·L^-1. Furthermore, complex 1a presented the semiquantitative visual detection ability for HSO₃^- in the test trip mode via fluorescence changes.

以生物质橙子皮为原料，通过简单的一步水热法制备了橙子皮基碳量子点(orange peel-based carbon quantum dots，OP-CQDs)，并用荧光分析法对其性质进行了研究。结果表明，OP-CQDs水溶性好、荧光强、在生理pH范围内性能稳定。OP-CQDs对铁离子(Fe³⁺)有特异性猝灭反应且灵敏度高，同时，L-抗坏血酸(L-ascorbic acid，L-AA)能够使OP-CQDs-Fe³⁺体系的荧光部分恢复，形成了“开-关-开”的荧光检测体系。Fe³⁺和L-AA的检出限分别为1.1和31.8 μmol·L^-1。

缩短沸石材料的微孔孔道能有效提升客体分子的扩散传质性能。但目前一维L沸石(LTL)的合成中，缩短其沿一维微孔孔道方向(c轴方向)的长度至20到50 nm仍是一个挑战。本文首次在简单无机体系中通过加入纳米棒簇状L沸石作为晶种，快速(仅需4 h)合成了一种新型的L沸石介观结构晶体，且无需外加任何晶化修饰剂与模板剂。该介晶呈现出一种由超薄(约29 nm)的圆盘纳米晶沿c轴定向堆叠而成的盘簇形貌。这一独特的晶种诱导策略能够有效解耦L沸石的成核和生长阶段，为精确调控每个阶段的晶化行为以获得所需形貌结构提供了更大的操作空间。通过分析合成体系中介观尺度的晶核和微观尺度的基本构建单元衍化规律，实现了对晶种具体作用及衍化规律的解构：晶种溶解出的环笼结构加速了凝胶有序化，缩短了诱导期；而晶种溶解后的残余部分为生长期提供了密集的初始晶核，导向了新型盘簇结构的形成。通过对沸石生长条件进行调节，证实了其生长期存在蠕虫状前驱颗粒组装的行为，并实现了对盘簇中圆盘沿c轴方向厚度在18到55 nm范围内的精细调控。此外，通过选择直径为0.43到4.5 nm的系列模型分子作为吸附质，证明了该超短c轴样品在气相和液相体系大幅增强的吸附应用潜力。样品在小分子的扩散速率和大分子在气相的吸附量方面确实具有优势。在实际应用中，该样品在芳烃的吸附和分离以及染料和蛋白质的吸附方面具有一定的优势。

Herein, we report the synthesis and third-order nonlinear optical (NLO) properties of a novel cage-based 2D metal-organic framework constructed from Ti₄L₆ (L^4-=embonate) cage combined with Mg²⁺ and tris[4-(1H-imidazol-1-yl)phenyl]amine (tipa) ligand, whose molecular formula is (Me₂CH₂)₂[Mg₃(Ti₄L₆)(tipa)(H₂O)₁₂] (PTC-378). The Ti₄L₆ tetrahedral cages serve as robust building units, while the Mg²⁺ ions and tipa ligands provide structural stability and tunable optical properties. The resulting PTC-378 film exhibited intriguing third-order NLO property, which was systematically investigated using Z-scan techniques. Our results demonstrate that the synergistic interaction between Ti₄L₆ cages and π-conjugated ligands significantly enhances the NLO performance of the materials.