A new fluorescent mesoporous polyurethane (PU) (9) was synthesized by reaction between 2,2′-(methylenebis(4,1-phenylene))bis(5-isocyanatoisoindoline-1,3-dione) (Diisocyanate) (5) and 4,4′,4″-((1,3,5-triazine-2,4,6-triyl)tris (azanediyl))triphenol (Triol, TO) (8) (molar ratio 3:2). PU was characterized by using FT-IR, ¹H-NMR, XRD, UV-Vis, TGA, Nitrogen adsorption-desorption isotherm, BET, FE-SEM and Photoluminescence (PL) analyses. To the best of our knowledge, this is the first time that a fluorescent polyurethane has been made without the use of commercial fluorescent materials. PU has high fluorescent intensity and it is ultrafast (about few seconds), highly selective and sensitive turn-off fluorescent sensor for Fe³⁺ ions. This chemosensor exhibited a wide concentration range of (10–250)×10⁻⁶ M Fe³⁺ with quenching efficiency (η) 97.50%. Limit of detection (LOD), limit of quantification (LOQ) and quenching constant (Ksv) values were calculated 10.10×10⁻⁶ M, 30.60×10⁻⁶ M and 6919.31 M⁻¹, respectively. Nitrogen doped carbon dots (N-doped CDs) as fluorescent nanoparticles and with the aim of improving Fe³⁺ detecting were synthesized by microwave-assisted and using citric acid monohydrate (10) and ethylenediamine (11) as carbon and nitrogen sources, respectively. Fluorescent nanocomposites (FNCs) were prepared by using casting and in-situ methods. In both methods, two nanocomposites containing 5 and 10%w of N-doped CDs were prepared. FNCs were characterized by using FT-IR, UV-Vis, XRD, TGA, Nitrogen adsorption-desorption isotherm, BET, FE-SEM and PL analyses. All nanocomposites showed better thermal property and sensitivity and lower LOD values in lower concentration of Fe³⁺ related to PU. Among them, FNC10in exhibited the best results as η, LOD, LOQ, Ksv reached 99.80%, 1.15×10⁻⁶ M, 3.48×10⁻⁶ M and 53,551.48 M⁻¹, respectively.

通过2,2'-（亚甲基双（4,1-亚苯基））双（5-异氰酸根合异吲哚啉-1,3-二酮）（二异氰酸酯）（5）与苯的反应合成了一种新型的荧光中孔聚氨酯（PU）（9）。4,4'，4''-（（（1,3,5-triazine-2,4,6-triyl）tris（azanediyl））triphenol（Triol，TO）（8）（摩尔比3：2）。PU的特征在于使用FT-IR，¹ H-NMR，XRD，UV-Vis，TGA，氮吸附-解吸等温线，BET，FE-SEM和光致发光（PL）分析。据我们所知，这是第一次在不使用商业荧光材料的情况下制造荧光聚氨酯。PU具有高荧光强度，并且超快（约几秒钟），针对Fe ^3+的高选择性和灵敏的关断荧光传感器离子。该化学传感器表现出（10–250）×10 ^-6  M Fe ³⁺的宽浓度范围，淬灭效率（η）为97.50％。分别计算出检测限（LOD），定量限（LOQ）和淬灭常数（Ksv）值10.10×10 ^-6  M，30.60×10 ^-6  M和6919.31 M ^-1。以微波辅助，柠檬酸一水合物（10）和乙二胺（11）为原料，合成了氮掺杂碳点（N掺杂CD）作为荧光纳米颗粒，目的是改善Fe ^3+的检测。）分别作为碳和氮源。荧光纳米复合材料（FNCs）是使用浇铸和原位方法制备的。在两种方法中，均制备了两种含有5％和10％w的N掺杂CD的纳米复合材料。通过使用FT-IR，UV-Vis，XRD，TGA，氮吸附-解吸等温线，BET，FE-SEM和PL分析来表征FNC。所有的纳米复合材料在与聚氨酯相关的较低的Fe ³⁺浓度下均表现出更好的热性能和灵敏度，并具有较低的LOD值。其中，FNC10in表现出最好的结果，η，LOD，LOQ，Ksv分别达到99.80％，1.15×10 ^-6  M，3.48×10 ^-6  M和53,551.48 M ^-1。