Department of Chemical Thermodynamics and Kinetics, Institute of Chemistry, Saint Petersburg State University, 198504 Saint Petersburg, Russia.
Molecules. 2023 Jun 16;28(12):4807. doi: 10.3390/molecules28124807.
A protonated and hydrated Dion-Jacobson-phase HSrNbO∙yHO was used to prepare two series of inorganic-organic derivatives containing non-covalently intercalated -alkylamines and covalently grafted -alkoxy groups of different lengths, as they are promising hybrid materials for photocatalytic applications. Preparation of the derivatives was carried out both under the conditions of standard laboratory synthesis and by solvothermal methods. For all the hybrid compounds synthesized structure, quantitative composition, a type of bonding between inorganic and organic parts as well as light absorption range were discussed using powder XRD, Raman, IR and NMR spectroscopy, TG, elemental CHN analysis, and DRS. It was shown that the inorganic-organic samples obtained contain approximately one interlayer organic molecule or group per proton of the initial niobate, as well as some amount of intercalated water. In addition, the thermal stability of the hybrid compounds strongly depends on the nature of the organic component anchoring to the niobate matrix. Although non-covalent amine derivatives are stable only at low temperatures, covalent alkoxy ones can withstand heat up to 250 °C without perceptible decomposition. The fundamental absorption edge of both the initial niobate and the products of its organic modification lies in the near-ultraviolet region (370-385 nm).
采用质子化和水合的 Dion-Jacobson 相 HSrNbO·yHO 制备了两种含有非共价插层 - 烷基胺和共价接枝不同长度 - 烷氧基的无机-有机衍生物系列，因为它们是用于光催化应用的有前途的混合材料。在标准实验室合成条件下和溶剂热方法下进行了衍生物的制备。对于所有合成的混合化合物，使用粉末 XRD、拉曼、IR 和 NMR 光谱、TG、元素 CHN 分析和 DRS 讨论了结构、定量组成、无机和有机部分之间的键类型以及光吸收范围。结果表明，所得的无机-有机样品每质子含有大约一个层间有机分子或基团，以及一定量的插层水。此外，混合化合物的热稳定性强烈取决于与铌酸盐基质结合的有机组分的性质。尽管非共价胺衍生物仅在低温下稳定，但共价烷氧基衍生物在高达 250°C 的温度下也能承受而不会明显分解。初始铌酸盐和其有机修饰产物的基本吸收边缘都位于近紫外区域（370-385nm）。
