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提出了一种纳米γ-Fe2O3催化还原硝基成氨基的新方法,通过使用γ-Fe2O3在液相中异丙醇作氢化给予体,KOH为促进剂来研究含硝基化合物的化学选择还原。就像是在麦尔外因-彭杜尔夫(MPV)还原中H-给体的活性中心一样,异丙醇吸附在催化剂γ-Fe2O3上形成了醇盐,把氢负离子转移给硝基正离子,氢氧化钾是助催化剂,帮助电子的转移。催化剂γ-Fe2O3在合成中表现出良好的活性,反应速率、产率大大提高。并进一步合成了具有荧光性能的2-苯基-5-(甲基丙烯酰胺基取代苯基)-1,3,4-口恶二唑。用红外光谱、质谱、核磁共振谱和元素分析对合成化合物进行了结构表征。用荧光光谱仪对它们的荧光性能进行了测试,最大激发波长在333nm左右,最大发射波长在445nm左右,测试结果表明目标产物具有良好的荧光性,荧光量子产率高达0.47。
A new method for the catalytic reduction of nitro to amino with nano-γ-Fe2O3 was proposed. The chemical selective reduction of nitro compounds was studied by using isopropanol as hydrogen donor and γ-Fe2O3 as accelerant in the liquid phase. Like the H-donor active site in Melvin-Penndorf (MPV) reduction, isopropanol is adsorbed on the catalyst γ-Fe2O3 to form alkoxides that transfer hydride ions to the nitro-cation , Potassium hydroxide is a cocatalyst to help the transfer of electrons. The catalyst γ-Fe2O3 showed good activity in the synthesis, the reaction rate, the yield was greatly improved. Furthermore, 2-phenyl-5- (methacryloylamino-substituted phenyl) -1,3,4-oxadiazole with fluorescence property was synthesized. The synthesized compounds were characterized by FTIR, MS, 1HNMR and elemental analysis. Fluorescence spectroscopy was used to test their fluorescence properties. The maximum excitation wavelength was about 333 nm and the maximum emission wavelength was about 445 nm. The results showed that the target product had good fluorescence and the fluorescence quantum yield was as high as 0.47.