2D and 3D Ruthenium Nanoparticle Covalent Assemblies for Phenyl Acetylene Hydrogenation
作者:Yuanyuan Min、Faqiang Leng、Bruno F. Machado、Pierre Lecante、Pierre Roblin、Hervé Martinez、Thomas Theussl、Alberto Casu、Andrea Falqui、María Barcenilla、Silverio Coco、Beatriz María Illescas Martínez、Nazario Martin、M. Rosa Axet、Philippe Serp
DOI:10.1002/ejic.202000698
日期:2020.11.22
Here, two new organic linkers were used as buildingblocks in order to guide the organization of Ru NP into two‐ or three‐dimensional covalent assemblies. The use of a hexa‐adduct functionalized C60 leads to the formation of 3D networks of 2.2 nm Ru NP presenting an interparticle distance of 3.0 nm, and the use of a planar carboxylic acid triphenylene derivative allows the synthesis of 2D networks
Generation of metallomesogens using common ligands functionalised with liquid-crystalline moieties
作者:Indudhara S. Shashikala、Duncan W. Bruce
DOI:10.1039/b717428d
日期:——
Functionalisation of 2,2′-bipyridine or acetylacetone with an alkyleneoxycyanobiphenyl group induces liquid-crystalline properties in simple metal complexes.
2,2′-联吡啶或乙酰丙酮与亚烷氧基氰基联苯基团的官能化作用可诱导简单金属络合物的液晶特性。
Synthesis of Mono- and Disaccharide 4-[(ω-Sulfanylalkyl)oxy]benzoylhydrazones as Potential Glycoligands for Noble Metal Nanoparticles
作者:A. Yu. Ershov、A. A. Martynenkov、I. V. Lagoda、A. V. Yakimansky
DOI:10.1134/s1070363219020208
日期:2019.2
procedure has been developed for the synthesis of previously unknown aldose 4-[(ω-sulfanylalkyl) oxy]benzoylhydrazones (where alkyl is hexyl or decyl and aldoses are D-glucose, D-galactose, D-maltose, and D-lactose) that a repromising glycoligands for noble metal nanoparticles. According to the 1H and 13C NMR data, 4-[(ω-sulfanylalkyl)oxy]benzoylhydrazones derived fromD-glucose, D-maltose, and D-lactose in
已经开发出一种合成先前未知的醛糖4-[((ω-硫烷基烷基)氧基]苯甲酰基hydr(其中烷基为己基或癸基,醛糖为D-葡萄糖,D-半乳糖,D-麦芽糖和D-乳糖)的合成方法贵金属纳米粒子的有前景的糖配体。根据1 H和13 C NMR数据,在晶体和DMSO- d 6溶液中,衍生自D-葡萄糖,D-麦芽糖和D-乳糖的4-[(ω-硫烷基烷基)氧基]苯甲酰基hydr仅具有环状吡喃糖。结构(α-和β-异头物)。在DMSO- d 6溶液中的D-半乳糖4-[[(ω-硫烷基烷基)氧基]苯甲酰基hydr为环状吡喃糖和开链酰基hydr结构的互变异构混合物。
Fabrication of a nanoparticle gradient substrate by thermochemical manipulation of an ester functionalized SAM
作者:Parvez Iqbal、Kevin Critchley、James Bowen、David Attwood、David Tunnicliffe、Stephen D. Evans、Jon A. Preece
DOI:10.1039/b712687e
日期:——
The hydrolysis of methyl ester (–CO2Me) and tert-butyl ester (–CO2tBu) functionalized SAMs as a function of subphase temperature and pH is described. Contact angle measurements show that the methyl ester functionalized monolayer does not hydrolyse in pH 1–13 aqueous solutions heated up to 80 °C. In contrast, the –CO2tBu functionalized monolayer hydrolysed below pH 5. The rate and the extent of the hydrolysis were dependent on the temperature and pH of the aqueous solution. Using the Cassie equation, the activation energy for the hydrolysis of CO2tBu-phenyl functionalized SAM was determined as 75 ± 7 kJ mol−1 from the contact angle measurements. Furthermore, the adhesion properties of –CO2tBu and –COOH functionalized SAMs were investigated by depositing –NR2 and –COOH functionalized polystyrene nanoparticles onto the surfaces at pH 3 and 9. By AFM, it was observed that the particles bind preferentially to the –COOH functionalized SAM and the adhesion was pH dependent, with the largest coverage being observed at pH 3. Using the acquired understanding of the hydrolysis of –CO2tBu functionalized SAM and the particle adhesion properties, a simple and facile approach towards fabricating a particle density gradient on this surface is demonstrated. An acid gradient SAM (20 mm long) was prepared by mounting one end of a –CO2tBu functionalized SAM onto the hot side of a Peltier element (80 °C) in pH 1 aqueous solution. The substrate was subsequently immersed into a colloidal solution of –NR2 functionalized polystyrene nanoparticles, removed and rinsed. By AFM, the particle density was shown to be dependent on the surface coverage of –COOH moieties of the underlying SAM. The density started at 104 particles µm−2 on the hydrolysed end down to 0 particles µm−2 on the non-hydrolysed end.