-oxindoles were prepared efficiently multicomponent reactions (MCRs) for finding the new chemosensors. Also, the use of the efficient nanocatalysts based on SBA-15 in these reactions are so important. Therefore, the functionalization of SBA-15 by different organic compounds are common to produce new efficient nanocatalysts. Herein, SBA-Pr-N-Is-Bu-SOH as an efficient nanoporous catalyst was applied in the synthesis of (5,6,7,8-tetrahydro-chromene)-4,3′-cyclic oxindoles through the three-component reaction of isatin derivatives, malononitrile and dimedone under reflux conditions in high yield and short reaction time. Among all -oxindole derivatives, 2-amino-7,7-dimethyl-5′-nitro-2′,5-dioxo-5,6,7,8-tetrahydro-spiro[chromen-4,3′-indoline]-3-carbonitrile was investigated in fluoresence spectroscopy. According to the obtained results it was observed that in the presence of various cations such as, K, Ca, Na, Cu, Zn, Cr, Fe, Fe, Mn, Co, Al, Pb, Ag, Cd, Ni, Hg and Mg, it can selectively detect Hg ion and increase the emission intensity. Its calculated detection limit was 4.6 × 10 M, which can be considered a good value. Also, in order to determine the stoichiometric ration for ligand and Hg ion, Job's plot test was performed and the ratio was 1:2.

中文翻译：

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使用 SBA-Pr-N-IS-Bu-SO3H 合成基于螺吲哚的化学传感器，用于检测 Hg2+ 离子

- 羟吲哚通过多组分反应（MCR）有效制备，用于寻找新的化学传感器。此外，在这些反应中使用基于 SBA-15 的高效纳米催化剂非常重要。因此，通过不同的有机化合物对SBA-15进行官能化是生产新型高效纳米催化剂的常见方法。本文将SBA-Pr-N-Is-Bu-SOH作为一种高效的纳米孔催化剂应用于通过三组分合成(5,6,7,8-四氢色烯)-4,3'-环羟吲哚靛红衍生物、丙二腈和双甲酮在回流条件下反应，收率高，反应时间短。在所有β-羟吲哚衍生物中，2-氨基-7,7-二甲基-5'-硝基-2',5-二氧代-5,6,7,8-四氢-螺[铬-4,3'-二氢吲哚]-在荧光光谱中研究了 3-甲腈。根据获得的结果，观察到在各种阳离子如 K、Ca、Na、Cu、Zn、Cr、Fe、Fe、Mn、Co、Al、Pb、Ag、Cd、Ni、Hg 和Mg，可以选择性地检测Hg离子并增加发射强度。计算出的检出限为4.6×10 M，可以认为是一个不错的值。另外，为了确定配体和Hg离子的化学计量比，进行了乔布图测试并且该比例为1:2。