Synthesis and characterization of a new poly α-amino acid Co(II)-complex supported on magnetite graphene oxide as an efficient heterogeneous magnetically recyclable catalyst for efficient free-coreductant gram-scale epoxidation of olefins with molecular oxygen
作者:Milad Kazemnejadi、Boshra Mahmoudi、Zeinab Sharafi、Mohammad Ali Nasseri、Ali Allahresani、Mohsen Esmaeilpour
DOI:10.1016/j.jorganchem.2019.05.030
日期:2019.9
was characterized by various analytical and spectroscopic methods including FTIR, ICP, XRD, EDX, XPS, FE-SEM, TEM, TGA, VSM and DLS analyses. A wide variety of olefins could be tolerated toward epoxidation in the presence of molecular oxygen without the need for any co-reductant. The magnetic nanocomposite could be readily separated by a magnet from the mixture and reused for several times without any
通过将合成的聚α-氨基酸的钴配合物固定在掺杂Fe 3 O 4的氧化石墨烯(GO / Fe 3 O 4)上,制备了一种新型的磁性纳米复合材料。@PAA Co(II)),被证明是在温和条件下烯烃环氧化的高效催化剂。PAA是通过多步合成法合成的,首先是水杨醛的缩聚反应,然后是Strecker合成法。通过多种分析和光谱方法对合成的纳米复合材料进行了表征,包括FTIR,ICP,XRD,EDX,XPS,FE-SEM,TEM,TGA,VSM和DLS分析。在分子氧存在下,可以耐受多种烯烃进行环氧化而无需任何助还原剂。磁性纳米复合材料很容易被磁体从混合物中分离出来,并重复使用几次,而没有任何明显的反应活性损失,这代表了其在实际和工业应用中的潜力。还,