22948-06-7Relevant articles and documents
Zinc(ii) and cadmium(ii) amorphous metal-organic frameworks (aMOFs): Study of activation process and high-pressure adsorption of greenhouse gases
Almá?i, Miroslav,Bourrelly, Sandrine,Király, Nikolas,Vilková, Mária,Zeleňák, Vladimír
, p. 20137 - 20150 (2021)
Two novel amorphous metal-organic frameworks (aMOFs) with chemical composition {[Zn2(MTA)]·4H2O·3DMF}n (UPJS-13) and {[Cd2(MTA)]·5H2O·4DMF}n (UPJS-14) built from Zn(ii) and Cd(ii) ions and extended tetrahedral tetraazo-tetracarboxylic acid (H4MTA) as a linker were prepared and characterised. Nitrogen adsorption measurements were performed on as-synthesized (AS), ethanol exchanged (EX) and freeze-dried (FD) materials at different activation temperatures of 60, 80, 100, 120, 150 and 200 °C to obtain the best textural properties. The largest surface areas of 830 m2 g-1 for UPJS-13 (FD) and 1057 m2 g-1 for UPJS-14 (FD) were calculated from the nitrogen adsorption isotherms for freeze-dried materials activated at mild activation temperature (80 °C). Subsequently, the prepared compounds were tested as adsorbents of greenhouse gases, carbon dioxide and methane, measured at high pressures. The maximal adsorption capacities were 30.01 wt% CO2 and 4.84 wt% CH4 for UPJS-13 (FD) and 24.56 wt% CO2 and 6.38 wt% CH4 for UPJS-14 (FD) at 20 bar and 30 °C.
COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE INCLUDING THE SAME
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Paragraph 0328-0329, (2021/03/05)
A compound according to an embodiment of the present disclosure is represented by Formula 1: When the compound is used in an organic light-emitting device, efficiency is higher as compared to when existing compounds in the art are used. In particular, the compound shows a remarkable effect of lifespan improvement, resulting in a significantly increased lifespan of the organic light-emitting device including the compound.
Molecular Vise Approach to Create Metal-Binding Sites in MOFs and Detection of Biomarkers
Wang, Yang,Liu, Qi,Zhang, Qin,Peng, Bosi,Deng, Hexiang
supporting information, p. 7120 - 7125 (2018/06/15)
We report a new approach to create metal-binding site in a series of metal–organic frameworks (MOFs), where tetratopic carboxylate linker, 4′,4′′,4′′′,4′′′′-methanetetrayltetrabiphenyl-4-carboxylic acid, is partially replaced by a tritopic carboxylate linker, tris(4-carboxybiphenyl)amine, in combination with monotopic linkers, formic acid, trifluoroacetic acid, benzoic acid, isonicotinic acid, 4-chlorobenzoic acid, and 4-nitrobenzoic acid, respectively. The distance between these paired-up linkers can be precisely controlled, ranging from 5.4 to 10.8 ?, where a variety of metals, Mg2+, Al3+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Ag+, Cd2+ and Pb2+, can be placed in. The distribution of these metal-binding sites across a single crystal is visualized by 3D tomography of laser scanning confocal microscopy with a resolution of 10 nm. The binding affinity between the metal and its binding-site in MOF can be varied in a large range (observed binding constants, Kobs from 1.56×102 to 1.70×104 L mol?1), in aqueous solution. The fluorescence of these crystals can be used to detect biomarkers, such as cysteine, homocysteine and glutathione, with ultrahigh sensitivity and without the interference of urine, through the dissociation of metal ions from their binding sites.
Divergent Synthesis of Porous Tetraphenylmethane Dendrimers
Urzúa, Julio I.,Torneiro, Mercedes
, p. 13231 - 13238 (2017/12/26)
Tetraphenylmethane-ethynylene-based shape-persistent dendrimers are a new class of nanoobjects with an intriguing 3D architecture. We report an efficient divergent strategy for their synthesis based on the Sonogashira Pd-catalyzed coupling of terminal alkynes with aryl iodides. As repeat unit, we prepared a tetraphenylmethane derivative bearing a terminal alkyne and three triazene moieties. Coupling of this building block to tetrakis(p-iodophenyl)methane afforded, after triazene activation, a dodecaiodo-terminated first generation dendrimer, which was transformed by another Sonogashira coupling into a methoxy-terminated second generation dendrimer with persistent globular shape and well-defined cavities. This work also unveils new aspects of triazene chemistry, i.e., the unprecedented efficient generation of an azo compound by mixing of a triazene with phenol.
First pre-functionalised polymeric aromatic framework from mononitrotetrakis(iodophenyl)methane and its applications
Verde-Sesto, Ester,Pintado-Sierra, Mercedes,Corma, Avelino,Maya, Eva M.,De La Campa, Jose G.,Iglesias, Marta,Sanchez, Felix
supporting information, p. 5111 - 5120 (2014/05/06)
Starting from mononitrotetrakis(iodophenyl)methane as monomer, we report the preparation of the first pre-functionalised porous aromatic frameworks (PAFs) and their application as supports for organometallic catalysts. Neutral coordinate imino-pyridine Schiff base (PAF-NPy) or chiral bis-amino (PAF-NPro) ligands were obtained by post-synthetic treatment of PAF-NH2 and treated with copper(I) or rhodium(I) to yield the corresponding supported transition-metal catalysts. The as-prepared PAF-NN-M catalysts exhibited activity and selectivity similar to that of the corresponding homogeneous catalysts and were easily removed from reaction media and recycled without loss of activity or selectivity. New copper catalysts: The preparation of pre-functionalised porous aromatic frameworks (PAFs) and their application as supports for organometallic catalysts (see figure) is reported for the first time.
Bulky 4-tritylphenylethynyl substituted boradiazaindacene: Pure red emission, relatively large Stokes shift and inhibition of self-quenching
Zhang, Dakui,Wen, Yugeng,Xiao, Yi,Yu, Gui,Liu, Yunqi,Qian, Xuhong
scheme or table, p. 4777 - 4779 (2009/03/12)
Bulky 4-tritylphenylethynyl substituted boradiazaindacene with pure red emission, relatively large Stokes shift, high fluorescence quantum yield, and low self-quenching was efficiently synthesized and qualified as a potential EL dopant. The Royal Society of Chemistry.
Convenient syntheses of tetraarylmethane starting materials
Zimmermann, Thomas J.,Mueller, Thomas J. J.
, p. 1157 - 1162 (2007/10/03)
Tetraphenylmethane (1) and several functionalized tetraphenylmethanes 4-7, all of them useful building blocks for the construction of tetraarylmethane frameworks, are readily synthesized by improved standard procedures in multigram quantities. The structure of compound 5 has been additionally corroborated by an X-ray structure analysis. The novel class of tetrakis(thiazolylphenyl)methanes 8 showing a significant blue emission upon UV-excitation can be prepared in good yield by Hantzsch synthesis starting from the tetra(α-bromoketone) derivative 4b.
Tetrastyrylmethane
Su, Dan,Menger
, p. 1485 - 1488 (2007/10/03)
The first synthesis of tetrastyrylmethane is reported.
The rearrangement of N-triarylmethyl anilines to their p-triarylmethyl derivatives
Siskos, Michael G.,Tzerpos, Nikolaos I.,Zarkadis, Antonios K.
, p. 759 - 768 (2007/10/03)
The N-triarylmethyl anilines Ph3C-NHAr (Ar = Ph, o-Me-C6H4, m-Me-C6H4, p-Me-C6H4, p-O2N-C6H4, p-Ph3C-C6H4) and Ar'3C-NHPh tBu-C6H4)3C> prepared by the reaction of Ph3C-Cl with anilines ArNH2 and of the corresponding chlorides Ar'3C-Cl with aniline (at 50-100 deg C), undergo a Hoffmann-Martius rearrangement to p-triarylmethyl derivatives (i.e., p-Ar'3C-C6H4-NH2 for Ar = Ph) when they are heated (ca. 185 deg C) with equimolar amounts of PhNH3(1+)Cl(1-).The latter catalyses the rearrangement probably through the formation of the instable anilinium salt Ar'3C-NH2Ar(1+)Cl(1-) that serves as a Ar'3C(1+) ion source.Ar'3C(1+) in a second step (electrophilic aromatic substitution) leads with excess of ArNH2 to p-substituted derivatives (e.g. p-Ar'3C-C6H4-NH2).A free radical mechanism, resonable in view of the high temperatures used (ca. 185 deg C), could be excluded; Ar'3C-NHAr undergoes homolysis of the C-N bond to Ar'3C. radicals at temperatures higher than 200 deg C, a fact which was established using ESR spectroscopy and product analysis.
Efficient Catalysis of Hydrodediazoniations in Dimethylformamide
Wassmundt, Frederick W.,Kiesman, William F.
, p. 1713 - 1719 (2007/10/02)
For hydrodediazoniations (the replacement of a diazo group by hydrogen) in DMF, several substances act as catalysts through their ability to serve as electron donors and initiate free-radical reactions.A general procedure has been developed in which FeSO4 speeds the conversion and leads to higher yields.Trapping experiments demonstrated the presence of free-radical intermediates.N,N-Dimethylacetamide was found to rival DMF as a source of hydrogen atoms.
