Abstract A Zn complex was stepwise intercalated in a Mg/Al layered double hydroxide material (HT) holding phenylalanine in its interlayer spacing. The material was characterized by powder X-ray diffraction, FTIR and solid state 13C NMR spectroscopy. By analogy, the [Zn(phe)(H2O)](NO3) complex bearing deprotonated phenylalanine (phe) amino acid as ligand and a labile water molecule, mimicking biological moieties, was also prepared as model and characterized by HR-MS, FTIR and 1H solution NMR spectroscopy. Both the Zn-containing HT material and model complex were tested in the catalytic epoxidation of cyclooctene, styrene and 1-octene. All tests were carried out with hydrogen peroxide (H2O2) or tert-butylhydroperoxide (TBHP), leading selectively to epoxides in most cases. Both temperature and oxygen source were found to be key factors in controlling epoxide selectivity, especially when using H2O2, where results were outstanding. Furthermore, the reported results show that the catalytic performance of this Zn system is at the same level of similar systems, holding heavier metals and less sustainable, found in the literature, while the Zn-containing HT catalyst had also the advantage of recyclability.

中文翻译：

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用于烯烃与 H2O2 环氧化的锌仿生催化剂

摘要 Zn 配合物逐步嵌入层间距为苯丙氨酸的 Mg/Al 层状双氢氧化物材料 (HT) 中。通过粉末X射线衍射、FTIR和固态13C NMR光谱表征该材料。以此类推，以去质子化苯丙氨酸 (phe) 氨基酸为配体和不稳定水分子的 [Zn(phe)(H2O)](NO3) 配合物也被制备为模型，并通过 HR-MS、FTIR 表征和 1H 溶液核磁共振谱。含锌 HT 材料和模型复合物均在环辛烯、苯乙烯和 1-辛烯的催化环氧化中进行了测试。所有测试均使用过氧化氢 (H2O2) 或叔丁基过氧化氢 (TBHP) 进行，在大多数情况下会选择性地产生环氧化物。发现温度和氧源都是控制环氧化物选择性的关键因素，尤其是在使用 H2O2 时，效果非常好。此外，报道的结果表明，该锌系统的催化性能与文献中发现的类似系统处于同一水平，含有较重的金属且可持续性较差，而含锌的 HT 催化剂还具有可回收性的优势。