TEMPO supported amine functionalized magnetic titania: a magnetically recyclable catalyst for the aerobic oxidative synthesis of heterocyclic compounds
作者:Sukanya Sharma、Anu Choudhary、Shally Sharma、Tahira Shamim、Satya Paul
DOI:10.1007/s00706-020-02714-2
日期:2021.1
the immobilization of titania, APTES, and TEMPO on the magnetic nanoparticles. Thermal behaviour of the catalyst was studied by TGA. Morphology of the catalyst was investigated by FEG-SEM and HR-TEM analysis. Furthermore, loading content of TEMPO on the catalyst was quantified by elemental analysis and found to be 0.61 mmol/g. Magnetic properties of the catalyst were investigated by VSM analysis. The
摘要 本协议揭示了一种新的策略,用于合成高效的基于TEMPO的固体催化剂,其中4-氧-TEMPO被共价束缚在胺官能化的磁性二氧化钛表面。合成催化剂的化学性质和结构通过多种技术进行了验证,例如傅立叶变换红外光谱,热重分析,X射线粉末衍射,场发射枪扫描电子显微镜,高分辨率透射电子显微镜,能量色散X射线光谱,元素分析和振动样品磁力计。FT-IR证实了二氧化钛,APTES和TEMPO固定在磁性纳米颗粒上。通过TGA研究了催化剂的热行为。通过FEG-SEM和HR-TEM分析研究了催化剂的形态。此外,TEMPO在催化剂上的负载量通过元素分析定量,发现为0.61mmol / g。通过VSM分析研究了催化剂的磁性。已经研究了合成催化剂的催化性能,用于苯并咪唑的氧化合成,1,4-二氢吡啶的氧化芳构化和使用分子氧的吲哚的氧化三聚。另外,该催化剂可以成功地再循环和重复使用多达五次,而不会显着降低催化活性。4-二