The acidic ionic liquid supported on the magnetic mesoporous silica nanotubes (M-MSNTs/IL) was prepared as a new magnetic catalyst and fully characterized with FE-SEM, HR-TEM, EDS, TGA, BET, VSM, FT-IR, EDX, elemental mapping and XPS. The template of catalyst was magnetic aminated MWCNTs (M-MWCNTs/CONHBu), which removed through calcination process and magnetic mesoporous silica nanotubes (M-MSNTs) were obtained and functionalized using adenine based ionic liquid. The prepared catalyst was successfully applied as a new reusable heterogeneous catalyst for the one-pot three-component indeno[1,2-]indole-9,10-dione derivatives in water at 75 °C. All of desired products were obtained in good to excellent yields (79–96 %) after relatively short reaction times. M-MSNTs/IL also exhibited a remarkable performance with TOF of 61.2 h-1 and TON of 86.7. The use of M-MSNTs/IL catalyst in the synthesis of indeno[1,2-]indole-9,10-dione derivatives revealed several advantages including mild reaction conditions, high yield of pure products, clean reaction conditions, avoiding the production of toxic waste, chemical stability of the catalyst, low amount and reusability of catalyst. In addition, the applied nanocatalyst was recovered with an external magnet and reused 6 times without considerable reduction in its catalytic activity.

中文翻译：

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磁性介孔二氧化硅纳米管上离子液体（IL）的固定化：用于茚并[1,2-b]吲哚酮衍生物绿色合成的高通量、可重复使用的纳米催化剂

制备了负载在磁性介孔二氧化硅纳米管（M-MSNTs/IL）上的酸性离子液体作为新型磁性催化剂，并通过FE-SEM、HR-TEM、EDS、TGA、BET、VSM、FT-IR、EDX进行了全面表征、元素映射和 XPS。催化剂模板为磁性胺化多壁碳纳米管（M-MWCNTs/CONHBu），通过煅烧过程去除，得到磁性介孔二氧化硅纳米管（M-MSNTs），并利用腺嘌呤基离子液体进行功能化。所制备的催化剂成功应用于75℃水中一锅法三组分茚并[1,2-]吲哚-9,10-二酮衍生物的新型可重复使用多相催化剂。经过相对较短的反应时间后，所有所需产物均以良好至优异的产率 (79-96%) 获得。 M-MSNTs/IL也表现出优异的性能，TOF为61.2 h-1，TON为86.7。使用M-MSNTs/IL催化剂合成茚并[1,2-]吲哚-9,10-二酮衍生物显示出反应条件温和、产物纯品收率高、反应条件清洁、避免产生有毒废弃物，催化剂化学稳定性好，催化剂用量少，可重复使用。此外，所应用的纳米催化剂通过外部磁铁回收并重复使用6次，其催化活性没有明显降低。