Timár Zita, Hung Truong Ngoc, Pravda Cora, Kónya Zoltán, Kukovecz Ákos, Sipos Pál, Varga Gábor, Pálinkó István
Materials and Solution Structure Research Group and Interdisciplinary Excellence Centre, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, H-6720 Szeged, Hungary.
Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
Materials (Basel). 2021 Mar 4;14(5):1202. doi: 10.3390/ma14051202.
L-Cysteinate-intercalated CaAl-layered double hydroxide (LDH) was prepared by the co-precipitation method producing highly crystalline hydrocalumite phase with a well-pillared interlayer gallery. The obtained materials were characterized by X-ray diffractometry, IR as well as Raman spectroscopies. By performing interlamellar oxidation reactions with peracetic acid as oxidant, oxidation of cysteinate to cystinate in aqueous and cysteinate sulfenic acid in acetonic suspensions occurred. The oxidations could be performed under mild conditions, at room temperature, under neutral pH and in air. It has been shown that the transformation pathways are due to the presence of the layered structure, that is, the confined space of the LDH behaved as molecular reactor.
通过共沉淀法制备了L-半胱氨酸插层的钙铝层状双氢氧化物（LDH），得到了具有良好柱撑层间通道的高结晶水滑石相。通过X射线衍射、红外光谱以及拉曼光谱对所得材料进行了表征。以过氧乙酸为氧化剂进行层间氧化反应时，在水相中半胱氨酸盐被氧化为胱氨酸盐，在丙酮悬浮液中半胱氨酸盐被氧化为半胱氨酸亚磺酸。这些氧化反应可以在温和条件下，即室温、中性pH值和空气中进行。结果表明，转化途径归因于层状结构的存在，也就是说，LDH的受限空间起到了分子反应器的作用。
