118727-34-7Relevant articles and documents
Unveiling the Local Structure of Palladium Loaded into Imine-Linked Layered Covalent Organic Frameworks for Cross-Coupling Catalysis
Albacete, Pablo,Briois, Valérie,Mavrandonakis, Andreas,Platero-Prats, Ana E.,Romero-Mu?iz, Ignacio,Vega, Alicia,Zamora, Félix
, p. 13013 - 13020 (2020)
Layered covalent organic frameworks (2D-COFs), composed of reversible imine linkages and accessible pores, offer versatility for chemical modifications towards the development of catalytic materials. Nitrogen-enriched COFs are good candidates for binding Pd species. Understanding the local structure of reacting Pd sites bonded to the COF pores is key to rationalize interactions between active sites and porous surfaces. By combining advanced synchrotron characterization methods with periodic computational DFT modeling, the precise atomic structure of catalytic Pd sites attached to local defects is resolved within an archetypical imine-linked 2D-COF. This material was synthesized using an in situ method as a gel, under which imine hydrolysis and metalation reactions are coupled. Local defects formed in situ within imine-linked 2D-COF materials are highly reactive towards Pd metalation, resulting in active materials for Suzuki–Miyaura cross-coupling reactions.
Microporous polyimides with uniform pores for adsorption and separation of CO2 gas and organic vapors
Li, Guiyang,Wang, Zhonggang
, p. 3058 - 3066 (2013)
Three microporous polyimides, MPI-1, MPI-2, and MPI-3, with uniform pores were synthesized via one-pot polycondensation from tetrakis(4-aminophenyl) methane, tris(4-aminophenyl)amine and 1,3,5-tris(4-aminophenyl)benzene with pyromellitic dianhydride, respectively. The amorphous networks exhibit excellent thermal stability, large BET surface areas up to 1454 m2 g -1, and narrow pore size distribution in the range from 5 to 6 A. Their adsorption-desorption isotherms of CO2 are reversible, and the CO2 uptakes at 273 K and 1 bar are up to 16.8 wt %. Moreover, based on the ratios of initial slopes of isotherms, the CO 2/N2 and CO2/CH4 separation factors are as high as 102 and 12, respectively. The above CO2 adsorption and separation properties are attributed to the presence of abundant electron-rich heteroatoms in the polyimide networks and the unifrom ultralmicroporous structures. In addition, for MPI-1, the adsorption capacity of benzene vapor is 119.8 wt %, while the separation factors of benzene over nitrogen and water reach 342 and 28, respectively. The outstanding selective adsorptions of CO 2 gas and benzene vapor endow the microporous polyimides with promising potential in CO2 capture and separation as well as air- and water-cleaning applications.
A ferrocene-templated Pd-bearing molecular reactor
Gunka, Piotr A.,Kasprzak, Artur
, p. 6974 - 6979 (2020)
High-yield, chromatography-free syntheses of a ferrocene-templated molecular cage and its Pd-bearing derivative are presented. The formation of a symmetric cage-type structure was confirmed by single-crystal X-ray diffraction analysis. The Pd-bearing cage was used as an innovative catalyst for the efficient synthesis of 1,1'-biphenyls under mild conditions. The presented catalyst is reusable and 1,1'-biphenyls can be obtained efficiently in a gram scale process.
Dual-Functionalized Mixed Keggin- and Lindqvist-Type Cu24-Based POM@MOF for Visible-Light-Driven H2 and O2 Evolution
Shi, Dongying,Zheng, Rui,Liu, Chun-Sen,Chen, Di-Ming,Zhao, Junwei,Du, Miao
, p. 7229 - 7235 (2019)
The development of logical visible-light-driven heterogeneous photosystems for water splitting is a subject of new research. As the first example of a noble-metal-free photocatalyst for both H2 and O2 production, a high-nuclear {Cus
A chromatography-free total synthesis of a ferrocene-containing dendrimer exhibiting the property of recognizing 9,10-diphenylanthracene
Kasprzak, Artur,Nisiewicz, Monika K.,Nowicka, Anna M.
, p. 2483 - 2492 (2021)
Molecules comprising several ferrocene residues constitute an intriguing group of compounds for various applications. Here, the total synthesis of a new example of a ferrocene-containing dendrimer is presented. The target compound was obtained in excellent combined yield (65%) employing facile, chromatography-free methods at each step. Interesting findings, meeting the dynamic covalent chemistry concept, are reported. Cyclic voltammetry analyses revealed one pair of current signals for the ferrocene moieties. Ultimately, the synthesized ferrocene-containing dendrimer has been used as an innovative recognition material for 9,10-diphenylanthracene, a polycyclic aromatic hydrocarbon, with the limit of detection value equal to 0.06 μM. This journal is
Synthetic Approaches to Metallo-Supramolecular CoIIPolygons and Potential Use for H2O Oxidation
Ako, Ayuk M.,Elliott, Rory,Garciá-Melchor, Max,Kathalikkattil, Amal Cherian,Kruger, Paul E.,Mckeogh, Ian M.,Schmitt, Wolfgang,Soriano-López, Joaquín,Zhu, Nianyong,Zubair, Muhammad
, p. 14432 - 14438 (2020)
Metal-directed self-assembly has been applied to prepare supramolecular coordination polygons which adopt tetrahedral (1) or trigonal disklike topologies (2). In the solid state, 2 assembles into a stable halide-metal-organic material (Hal-MOM-2), which catalyzes H2O oxidation under photo- and electrocatalytic conditions, operating with a maximum TON = 78 and TOF = 1.26 s-1. DFT calculations attribute the activity to a CoIII-oxyl species. This study provides the first account of how CoII imine based supramolecules can be employed as H2O oxidation catalysts.
Electronic Decoupling in C3-Symmetrical Light-Responsive Tris(Azobenzene) Scaffolds: Self-Assembly and Multiphotochromism
Galanti, Agostino,Diez-Cabanes, Valentin,Santoro, Jasmin,Valá?ek, Michal,Minoia, Andrea,Mayor, Marcel,Cornil, Jér?me,Samorì, Paolo
, p. 16062 - 16070 (2018)
We report the synthesis of a novel C3-symmetrical multiphotochromic molecule bearing three azobenzene units at positions 1, 3, 5 of the central phenyl ring. The unique geometrical design of such a rigid scaffold enables the electronic decouplin
Benzothiadiazole functionalized D-A type covalent organic frameworks for effective photocatalytic reduction of aqueous chromium(vi)
Chen, Weiben,Yang, Zongfan,Xie, Zhen,Li, Yusen,Yu, Xiang,Lu, Fanli,Chen, Long
, p. 998 - 1004 (2019)
Covalent organic frameworks (COFs) have received increasing research interest as an emerging class of crystalline and porous polymers. Herein, we prepared two new benzothiadiazole (BT) functionalized COFs (i.e. TPB-BT-COF and TAPT-BT-COF), which exhibit g
PTSA-catalyzed green synthesis of 1,3,5-triarylbenzene under solvent-free conditions
Zhao, Yanan,Li, Jian,Li, Chunju,Yin, Kun,Ye, Dongyan,Jia, Xueshun
, p. 1370 - 1372 (2010)
An economical and green conversion of acetophenones into 1,3,5-triarylbenzenes catalyzed by PTSA is described. The present method is facile and chemo-selective without using any metal catalyst or solvent.
Micro- and mesoporous poly(Schiff-base)s constructed from different building blocks and their adsorption behaviors towards organic vapors and CO2 gas
Li, Guiyang,Zhang, Biao,Yan, Jun,Wang, Zhonggang
, p. 18881 - 18888 (2014)
Four porous poly(Schiff-base)s, PSN-DA, PSN-TAPB, PSN-TAPA and PSN-TAPM, are synthesized via one-pot condensation from 1,3,5,7-tetrakis(4-formylphenyl)adamantane with rod-like m-phenyldiamine, triangular 1,3,5-tris(4-aminophenyl)benzene and tris(4-aminophenyl)amine as well as tetrahedral tetrakis(4-aminophenyl)methane, respectively. It is found that the variation of the geometrical shape of the building blocks significantly alters the surface areas, pore sizes and distributions of the resultant porous polymers and thereby remarkably influences their adsorption behaviors towards organic vapors and CO2 gas. PSN-DA, PSN-TAPB and PSN-TAPA are microporous materials with pore sizes of 0.72, 0.95 and 1.04 nm, whereas PSN-TAPM is a micro- and mesoporous material with the major pores centered at 0.86 and 2.62 nm, respectively. Their BET surface areas are in the range from 419 to 1045 m2 g-1. At P/Po = 0.9 and 298 K, PSN-DA possesses high uptakes for both aromatic vapor (benzene, 86.1 wt%) and aliphatic vapor (cyclohexane, 77.9 wt%). In addition, the adsorption and desorption isotherms of CO2 gas in the four porous polymers are reversible-a characteristic which is convenient for the regeneration of CO2 adsorbents. Their adsorption capacities of CO2 are up to 15.0 wt% (273 K/1 bar) with the ideal selectivities of CO2/N2 and CO2/CH4 up to 71 and 14, respectively. showing potential applications in the removal of toxic organic vapors and capture of CO2 from air.