Fluorene‐based Lanthanide Coordination Polymer: Structure, Luminescence and Sensing of Picric Acid

Abstract

Luminescent coordination polymers can be potential chemosensors and extensive efforts are being devoted to improve their selectivity and sensitivity. In this work, we report a new kind of fluorene-based Tb-CP, Tb 4 L 6 ·7DMF·5H 2 O (Tb 4 L 6 , H 2 L = 4,4′-(9,9-dimethyl-9H-fluorene-2,7-diyl)dibenzoic acid), showing 2D network and strong blue emission. Meanwhile, Tb 4 L 6 exhibits excellent selectivity and sensitivity for picric acid (PA). The quenching constant (K sv ) of Tb 4 L 6 is equal to 4.5 × 10 4 L/mol during the concentration range of 0-30 μmol/L, which approaches the best reported CPs-based on PA sensor up to now. Moreover, we went into depth on the possible mechanisms of luminescence quenching.

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications

“…Similar study using the same framework to encapsulate CHCl 3 , DCM, and CCl 4 via SCSC manner and selectively detect aniline is also reported later . Other related 2D MOF sensors for NEs/NACs and pesticides detection are also reported in the literature. ,− …”

A Multifunctional Fluorescence Europium‐Organic Framework for Turn‐On Sensing of pH and Turn‐Off Sensing of 2‐Thiazolidinethione‐4‐carboxylic Acid and Aztreonam

“…[ 22 ] Compared to the emission spectra of H 4 adip, the maximum emission wavelength of 1 ( λ ex = 374 nm) is blue‐shifted by 58 nm, which may be attributed to the presence of coordination interactions. [ 23 ] We also characterized the solid state fluorescence spectrum of 1 . As shown in Figure S12, the optimal excitation wavelength is 413 nm, and the optimal emission wavelength is 437 nm.…”

Synthesis of 2,7-Diaryl Substituted Fluorenes and Fluorenones

“…M11 中含有的氧原子可能在反应中参与配位, 从而影响 反应活性, 化合物 24、28 和 29 的合成可在纯水中完成, 收率为 93%～97%, 但是 M11 的用量需要增加至 1.5 mol% [63] . M12 在 NHC 结构中引入苯环也可实现增加活 性中心空间位阻的作用, 0.03 mol%用量即可催化多种 37 (44), 38 (20), 39 (16), 40 (28), 41 (7), 42 (18), 43 (7), 44 a Isolated yield unless otherwise noted. GC＝GC yield.…”

“…The challenges of various synthetic methods at present are summarized and a brief outlook on possible solutions is provided. Keywords biaryl; fluorene; fluorenone; luminescent material; metallocene 2,7-二芳基取代芴/芴酮及其衍生物(图 1)具有较好 的热稳定性及易于调控结构和性能等优点 [1][2][3] , 不仅成 功应用于有机发光 [4][5][6][7] 、晶体管 [8][9][10][11] 和太阳能电池 [12][13] 等 有机半导体材料, 还广泛应用于聚集诱导发光 [14][15][16][17] 、化 学传感器 [18][19][20][21] 、离子交换和物质传输 [22][23][24][25] 、茂金属聚烯 烃催化剂 [26][27] 和网格化学 [28][29] 等众多前沿研究领域, 发 展前景广阔.然而, 2,7-二芳基取代芴/芴酮的合成依然面临挑战 (图 2A). 传统合成方法以含有联芳基结构的 2,2'-联苯二 甲酸为底物, 在大于 300 ℃的高温下脱水脱羧得到 2,7-二芳基取代芴酮, 再通过还原反应将其转化为 9-无取代 2,7-二芳基取代芴 [30] , 并通过碱性条件下的取代反应进 一步生成 9-取代 2,7-二芳基取代芴 [31][32][33] .…”