Cationic two-dimensional inorganic networks of antimony oxide hydroxide for Lewis acid catalysis
作者:Jinlin Yin、Honghan Fei
DOI:10.1039/c8dt00188j
日期:——
[Sb2O2(OH)]+ layers with linear α,ω-alkanedisulfonate anions residing in the interlamellar space. This cationic material displays a chemical robustness under highly acidic aqueous conditions (pH = 1). Combining the robust nature and the high density of SbIII sites on the exposed crystal facets, our cationic layered material is an efficient, recyclable catalyst for cyanosilylation of benzaldehyde derivatives
我们已经成功地合成了一个稀有的,具有正电荷的无机层状材料的实例,该材料完全位于层状双氢氧化物的同构结构之外。该层状结构由二维波纹状[Sb 2 O 2(OH)] +层和层间空间中的线性α,ω-链烷二磺酸根阴离子组成。这种阳离子材料在高酸性水溶液条件下(pH = 1)表现出化学稳定性。我们的阳离子层状材料结合了裸露的晶面上Sb III位置的坚固性和高密度,是一种高效,可回收的催化剂,用于苯甲醛衍生物与三甲基甲硅烷基氰化物的氰基硅烷化反应。此外,锑的路易斯酸度在“绿色”无溶剂条件下, III位还催化羰基的缩酮化。
Controlled Orientation of Polyconjugated Guest Molecules in Tunable Host Cavities
作者:Airon C. Soegiarto、Angiolina Comotti、Michael D. Ward
DOI:10.1021/ja106106d
日期:2010.10.20
sulfur atoms) and guests of various lengths (l(g)), the framework architecture can be controlled systematically in a manner that enables regulation of the guest orientation and aggregation in the host framework. Inclusion compounds for which l(g)/l(S-S) ≤ 0.9 exhibit a bilayer architecture with 1-D channels containing guests oriented parallel to the long axis of the pillar. Guests with values of l(g) comparable
Anion−π-Directed Self-Assembly between Di- and Trisulfonates and a Rigid Molecular Cage with Three Electron-Deficient V-Clefts
作者:Xue-Yuan Wang、Jun Zhu、Qi-Qiang Wang、Yu-Fei Ao、De-Xian Wang
DOI:10.1021/acs.inorgchem.9b00295
日期:2019.5.6
Anion−π-directed self-assembly between a series of di- and trisulfonate anions and a rigid molecular cage 1 was presented. The self-assembly study was established on a combination of X-ray crystallography, NMR, mass spectrometry (MS), and scanning electron microscopy (SEM) techniques. As revealed in the crystal structures, the cage provided two V-shaped electron-deficient clefts to accommodate sulfonate
提出了一系列由二磺酸盐和三磺酸盐组成的阴离子与刚性分子笼1之间的阴离子-π定向自组装。自组装研究是基于X射线晶体学,NMR,质谱(MS)和扫描电子显微镜(SEM)技术的结合而建立的。如晶体结构所示,笼子提供了两个V形缺电子裂隙,可通过阴离子-π相互作用容纳磺酸盐基团。取决于它们的结构,一系列阴离子显示出与笼子不同的分子间相互作用细节,并导致形成各种自组装基序。对于1,2-乙烷二磺酸盐(EDS 2 –),1,3-丙烷二磺酸盐(PDS 2–)和1,4-丁烷二磺酸盐(BDS)2-),形成了非常相似且统一的2D阶梯状自组装体。对于具有较长烷基链的1,6-己二磺酸盐(HDS 2–),形成了螺旋链组装,而1,3,5-三(4-磺基苯基)苯(TSPB 3–)导致形成3D框架结构。在溶液中,NMR滴定表明笼子可以使这些阴离子络合,缔合常数在5–114 M –1的范围内。在可变的浓度和温度下记录的NMR光谱和
Two cationic metal–organic frameworks based on cadmium and α,ω-alkanedisulfonate anions and their photoluminescent properties
作者:Honghan Fei、Scott R. J. Oliver
DOI:10.1039/c0dt01064b
日期:——
We have successfully synthesized three cadmium-based metalâorganic frameworks by utilizing two separate organic linkers to direct the structure. The first material is a three-dimensional neutral framework based on 2D cadmium ethanedisulfonate layers pillared by a 4,4â²-bipyridine linker. The other two materials are 3D cationic frameworks and are the first with propanedisulfonate and butanedisulfonate as extraframework charge balancing anions. Both structures occupy a high symmetry hexagonal crystal system where Cd-bipy chains are arranged into three crystallographically distinct layers that stack spirally along [001]. The framework is stabilized by alkanesulfonate anions that are electrostatically and hydrogen bonded to the framework. Each material was characterized by single-crystal and powder X-ray diffraction. The thermal and luminescent properties were also investigated by thermogravimetric analysis and photoluminescence spectroscopy, respectively. All three materials exhibit high thermal stability to above 300 °C and efficient blue emissive photoluminescence centered at 425 nm to 450 nm upon 350 nm excitation.