Topic
Oxamide
About: Oxamide is a research topic. Over the lifetime, 792 publications have been published within this topic receiving 8374 citations. The topic is also known as: Ethanediamide & oxalamide.
Papers published on a yearly basis
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Papers
TL;DR: A facile bottom-up strategy to improve the activity of a carbon nitride to a level in which a majority of photons are really used to drive photoredox chemistry, which enables efficient photochemistry also with green light.
Abstract: Polymeric or organic semiconductors are promising candidates for photocatalysis but mostly only show moderate activity owing to strongly bound excitons and insufficient optical absorption. Herein, we report a facile bottom-up strategy to improve the activity of a carbon nitride to a level in which a majority of photons are really used to drive photoredox chemistry. Co-condensation of urea and oxamide followed by post-calcination in molten salt is shown to result in highly crystalline species with a maximum π–π layer stacking distance of heptazine units of 0.292 nm, which improves lateral charge transport and interlayer exciton dissociation. The addition of oxamide decreases the optical band gap from 2.74 to 2.56 eV, which enables efficient photochemistry also with green light. The apparent quantum yield (AQY) for H2 evolution of optimal samples reaches 57 % and 10 % at 420 nm and 525 nm, respectively, which is significantly higher than in most previous experiments.
684 citations
TL;DR: In this paper, a strategy to optimize the textural properties and catalytic performance of g-C3N4 via using oxamide (OA) as a chemical modifier in the precursor solution, which significantly made the light absorption edge shift from 440 to 650 nm.
245 citations
TL;DR: These studies introduce an alternative paradigm for N(2) cleavage and functionalization in which the six-electron reductive cleavage is promoted by both the transition metal and the incoming ligand, CO, used for the new bond formations.
Abstract: Molecular nitrogen (N(2)) and carbon monoxide (CO) have the two strongest bonds in chemistry and present significant challenges in developing new transformations that exploit these two abundant feedstocks. At the core of this objective is the discovery of transition-metal compounds that promote the six-electron reductive cleavage of N(2) at ambient temperature and pressure and also promote new nitrogen-element bond formation. Here we show that an organometallic hafnium compound induces N(2) cleavage on the addition of CO, with a simultaneous assembly of new nitrogen-carbon and carbon-carbon bonds. Subsequent addition of a weak acid liberates oxamide, which demonstrates that an important agrochemical can be synthesized directly from N(2) and CO. These studies introduce an alternative paradigm for N(2) cleavage and functionalization in which the six-electron reductive cleavage is promoted by both the transition metal and the incoming ligand, CO, used for the new bond formations.
191 citations
Patent•
27 Jul 1979TL;DR: Alternating esteramide polymers are obtained from the reaction of bis-oxamidodiols such as N,N'-bis(ω-hydroxyalkylene)oxamide with a dicarboxylic acid or diesters such as diethyl oxalate, Diethyl succinate, diethsyl suberate, or dimethyl terephthalate.
Abstract: Alternating esteramide polymers are obtained from the reaction of bis-oxamidodiols such as N,N'-bis(ω-hydroxyalkylene)oxamide with a dicarboxylic acid or diesters such as diethyl oxalate, diethyl succinate, diethyl suberate, or dimethyl terephthalate. The polymers are obtained in good yield and have film- and fiber-forming properties. Some polymers are absorbable in biological systems and are useful as absorbable surgical devices. Other of these polymers are nonabsorbable and are useful as textile fibers.
135 citations
TL;DR: Grand canonical Monte Carlo (GCMC) simulations show excellent agreement with the experimental gas isotherm data, and a computational study of the specific interactions and binding energies of both CO2 and CH4 with the linkers in NOTT-125 reveals a set of strong interactions betweenCO2 and the oxamide motif that are not possible with a single amide.
Abstract: The porous framework [Cu2(H2O)2L]⋅4 H2O⋅2 DMA (H4L=oxalylbis(azanediyl)diisophthalic acid; DMA=N,N-dimethylacetamide), denoted NOTT-125, is formed by connection of {Cu2(RCOO)4} paddlewheels with the isophthalate linkers in L4−. A single crystal structure determination reveals that NOTT-125 crystallises in monoclinic unit cell with a=27.9161(6), b=18.6627(4) and c=32.3643(8) A, β=112.655(3)°, space group P21/c. The structure of this material shows fof topology, which can be viewed as the packing of two types of cages (cage A and cage B) in three-dimensional space. Cage A is constructed from twelve {Cu2(OOCR)4} paddlewheels and six linkers to form an ellipsoid-shaped cavity approximately 24.0 A along its long axis and 9.6 A across its central diameter. Cage B consists of six {Cu2(OOCR)4} units and twelve linkers and has a spherical diameter of 12.7 A taking into account the van der Waals radii of the atoms. NOTT-125 incorporates oxamide functionality within the pore walls, and this, combined with high porosity in desolvated NOTT-125a, is responsible for excellent CO2 uptake (40.1 wt % at 273 K and 1 bar) and selectivity for CO2 over CH4 or N2. Grand canonical Monte Carlo (GCMC) simulations show excellent agreement with the experimental gas isotherm data, and a computational study of the specific interactions and binding energies of both CO2 and CH4 with the linkers in NOTT-125 reveals a set of strong interactions between CO2 and the oxamide motif that are not possible with a single amide.
128 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 17 |
| 2024 | 1 |
| 2023 | 6 |
| 2022 | 10 |
| 2021 | 10 |
| 2020 | 10 |