Tag: M.W=50-100

Tian, Haiyuan published the artcileRecovery of natural products from deep eutectic solvents by mimicking denaturation, Application of 1-Methylurea, the main research area is deep eutectic solvent denaturation flavonoid natural product extraction adsorption; MIL 100 Cr synthesis flavonoid extraction Flos sophorae.

A strategy was developed to recover natural products from deep eutectic solvents based on denaturation of the solvents. A method similar to nucleic acid denaturation was used to disrupt the intermol. forces in the deep eutectic solvents to reduce their ability to solubilize and interact with the flavonoids at recovery. MIL-100 (Cr) was added to the system for sorptive separation and recovery of the target compounds from the denaturized deep eutectic solvents. The factors affecting denaturation of the deep eutectic solvents and adsorption of the target compounds were systematically investigated and optimized. The recovery method was further combined with mechanochem. extraction to establish a convenient and efficient protocol for obtaining natural products from plants. Moreover, due to the conjugated structure of MIL-100 (Cr), the adsorbed natural products could be directly analyzed by atm. matrix assisted laser desorption ionization-mass spectrometry (AP/MALDI-MS) without elution. This study provided a strategy for improving the efficiency of separation and recovery of natural products using deep eutectic solvents and also established a protocol for obtaining or analyzing natural products in a green, efficient, and convenient manner.

ACS Sustainable Chemistry & Engineering published new progress about Adsorption. 598-50-5 belongs to class isoquinoline, name is 1-Methylurea, and the molecular formula is C2H6N2O, Application of 1-Methylurea.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Cheng, Xian published the artcileExperimentally determined strengths of favorable and unfavorable interactions of amide atoms involved in protein self-assembly in water, Recommanded Product: 1-Methylurea, the main research area is protein folding self assembly amide hydrogen bonding sp interaction; additivity; amide atom interactions; aqueous interactions; preferential interactions; thermodynamics.

Folding and other protein self-assembly processes are driven by favorable interactions between O, N, and C unified atoms of the polypeptide backbone and side chains. These processes are perturbed by solutes that interact with these atoms differently than water does. Amide NHA·A·A·O=C hydrogen bonding and various π-system interactions have been better characterized structurally or by simulations than exptl. in water, and unfavorable interactions are relatively uncharacterized. To address this situation, we previously quantified interactions of alkyl ureas with amide and aromatic compounds, relative to interactions with water. Anal. yielded strengths of interaction of each alkylurea with unit areas of different hybridization states of unified O, N, and C atoms of amide and aromatic compounds Here, by osmometry, we quantify interactions of 10 pairs of amides selected to complete this dataset. An anal. yields intrinsic strengths of six favorable and four unfavorable atom-atom interactions, expressed per unit area of each atom and relative to interactions with water. The most favorable interactions are sp2O-sp2C (lone pair-π, presumably n-π*), sp2C-sp2C (π-π and/or hydrophobic), sp2O-sp2N (hydrogen bonding) and sp3C-sp2C (CH-π and/or hydrophobic). Interactions of sp3C with itself (hydrophobic) and with sp2N are modestly favorable, while sp2N interactions with sp2N and with amide/aromatic sp2C are modestly unfavorable. Amide sp2O-sp2O interactions and sp2O-sp3C interactions are more unfavorable, indicating the preference of amide sp2O to interact with water. These intrinsic interaction strengths are used to predict interactions of amides with proteins and chem. effects of amides (including urea, N-ethylpyrrolidone [NEP], and polyvinylpyrrolidone [PVP]) on protein stability.

Proceedings of the National Academy of Sciences of the United States of America published new progress about Additivity. 598-50-5 belongs to class isoquinoline, name is 1-Methylurea, and the molecular formula is C2H6N2O, Recommanded Product: 1-Methylurea.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yang, Qianqian published the artcileSolvent-Free Synthesis of N-Doped Porous Carbons from Chitosan for an Efficient CO2 Capture, Synthetic Route of 1455-77-2, the main research area is nitrogen doping carbon chitosan carbon dioxide adsorption.

A facile solvent-free strategy for constructing N-doped porous carbons (NPCs) by direct carbonization of chitosan with fully mixed N-sources is developed in this study. Carbonization temperatures and different N sources were thoroughly investigated to optimize the preparation conditions for better synthesis. Porosities and heteroatom doping (N doping) were comprehensively studied to figure out the effects on the CO2-uptake capacities of the NPCs. The obtained NPCs were fully characterized using different anal. techniques to explore their physicochem. properties and application potential. NPCs are found to perform greatly in porosities; In particular, NPCs prepared by grinding chitosan with 2,4,6-triaminopyrimidine followed by carbonization at 700°C exhibit CO2 adsorption capacities of 4.74 mmol g-1 (0°C and 1 bar). The abovementioned great CO2-uptake capacities as well as economical precursors and low energy demand indicate these chitosan-based NPCs to be promising industrial CO2-capture adsorbents.

Industrial & Engineering Chemistry Research published new progress about Adsorbents. 1455-77-2 belongs to class isoquinoline, name is 3,5-Diamino-1,2,4-triazole, and the molecular formula is C2H5N5, Synthetic Route of 1455-77-2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yang, Qianqian published the artcileSolvent-Free Synthesis of N-Doped Porous Carbons from Chitosan for an Efficient CO2 Capture, SDS of cas: 1455-77-2, the main research area is nitrogen doping carbon chitosan carbon dioxide adsorption.

A facile solvent-free strategy for constructing N-doped porous carbons (NPCs) by direct carbonization of chitosan with fully mixed N-sources is developed in this study. Carbonization temperatures and different N sources were thoroughly investigated to optimize the preparation conditions for better synthesis. Porosities and heteroatom doping (N doping) were comprehensively studied to figure out the effects on the CO2-uptake capacities of the NPCs. The obtained NPCs were fully characterized using different anal. techniques to explore their physicochem. properties and application potential. NPCs are found to perform greatly in porosities; In particular, NPCs prepared by grinding chitosan with 2,4,6-triaminopyrimidine followed by carbonization at 700°C exhibit CO2 adsorption capacities of 4.74 mmol g-1 (0°C and 1 bar). The abovementioned great CO2-uptake capacities as well as economical precursors and low energy demand indicate these chitosan-based NPCs to be promising industrial CO2-capture adsorbents.

Industrial & Engineering Chemistry Research published new progress about Adsorbents. 1455-77-2 belongs to class isoquinoline, name is 3,5-Diamino-1,2,4-triazole, and the molecular formula is C2H5N5, SDS of cas: 1455-77-2.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Gu, Lin published the artcileInsights into the role of an Fe-N active site in the oxygen reduction reaction on carbon-supported supramolecular catalysts, Product Details of C2H5N5, the main research area is iron nitrogen active site oxygen reduction carbon supramol catalyst.

In this study, a nitrogen-containing ligand supramol. named PPYTZ was successfully synthesized using 2,6-pyridinedicarboxylic acid chloride and 3,5-diamino-1,2,4-triazole in order to carry out oxygen reduction reaction (ORR). Such a polymer provides abundant coordination sites for iron ions, and the PPYTZ-Fe/C composite catalyst was formed with the PPYTZ-Fe complex loading on the surface of Vulcan XC-72 carbon. The phys. characteristics and ORR performance of the composite catalysts were characterized systematically via various relevant techniques, and their catalytic activity and reaction mechanism were evaluated and compared. The results showed that the catalytic activities and the reaction mechanism of ORR were highly dependent on the formation of an Fe-N unit. Accordingly, the PPYTZ-Fe/C catalyst containing Fe-N active sites exhibited high ORR catalytic activity (an onset potential of +0.86 V vs. RHE) in 0.1 M KOH. Such an Fe-N catalyst can accelerate the adsorption of O2 and increase the limiting c.d. (from 2.49 mA cm-2 to 4.98 mA cm-2), optimizing the ORR catalytic process from a two-electron process to a four-electron process (an n value of 3.8).

RSC Advances published new progress about Adsorption. 1455-77-2 belongs to class isoquinoline, name is 3,5-Diamino-1,2,4-triazole, and the molecular formula is C2H5N5, Product Details of C2H5N5.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Peng, An-Zhong published the artcileN-doped porous carbons derived from a polymer precursor with a record-high N content: Efficient adsorbents for CO2 capture, Recommanded Product: 3,5-Diamino-1,2,4-triazole, the main research area is nitrogen doped porous carbon polymer precursor; adsorbent carbon dioxide capture.

N-doped porous carbons (NPCs) are characterized by well-developed porosity and N-doped active sites, which makes them suitable for CO2 capture. However, their application in practice is obstructed by the relatively low N-doped content and unsatisfactory adsorption capacity. Herein, we report the synthesis of NPCs through the rational design of the precursor NUT-21 (NUT means Nanjing Tech University) with a record-high N content (up to 46.16%, wt). The NUT-21 was fabricated by the polymerization of two simple monomers of 2,4,6-tris(bromomethyl)mesitylene and 3,5-diamino-1,2,4-triazole with an unusually high N content of 70.67% (wt). With the carbonization of NUT-21 at different temperatures (500, 600, and 700°, resp.), a series of NPCs possessing various porosity and N contents are produced, successfully. For the NPC generated at 600°, the N content can reach 7.41% (wt), the surface area is 2208 m2/g, the micropore volume is 0.791 cm3/g, and the CO2 capacity is up to 8.3 mmol/g at 273 K and 1 bar, which is much higher than those of benchmarks including 13X zeolite (4.1 mmol/g) and activated carbon (2.8 mmol/g), and most carbon-based adsorbents reported till now. It was proved in our previous studies that the ultrahigh N content of the precursor was beneficial for both the formation of developed porosity and the generation of abundant N-doped sites, which can give rise to superior capacity and selectivity of CO2 capture. The NPCs obtained may offer to be highly promising candidates for CO2 separation from gas mixtures including natural gas and flue gas.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Adsorption. 1455-77-2 belongs to class isoquinoline, name is 3,5-Diamino-1,2,4-triazole, and the molecular formula is C2H5N5, Recommanded Product: 3,5-Diamino-1,2,4-triazole.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Chialvo, Ariel A. published the artcileOsmolyte-Induced Effects on the Hydration Behavior and the Osmotic Second Virial Coefficients of Alkyl-Substituted Urea Derivatives: Critical Assessment of Their Structure-Making/Breaking Behavior, COA of Formula: C2H6N2O, the main research area is osmotic virial coefficients Alkyl Substituted urea derivatives; Osmolyte Induced Effects Hydration Behavior.

We analyzed the hydration behavior of alkyl-substituted urea osmolytes in terms of their deviation from Lewis-Randall solution ideality and characterized their structure-making/breaking tendency according to a proposed solvation formalism that provides a rigorous cause-effect connection between the system microstructure and its solution thermodn. nonidealities. After a brief introduction of the rationale behind the use of Lewis-Randall over alternative solution ideality references, we (i) assessed the effect of the nature and type of alkyl substitution on the osmolyte-induced perturbation of the solution microstructure as a function of composition, (ii) analyzed their microstructural responses to changes in temperature and pressure, and (iii) demonstrated the structure-breaking nature of urea and the magnifying behavior of its alkyl-substituted osmolytes, whose trend follows the increasingly pos. deviation of the osmolyte solutions from Lewis-Randall ideality. Then, we discussed the falsifiability of a pair of frequently used conjectured structure-making/breaking criteria, supported by the derived exact relationships between the structure-making/breaking parameter, the solution thermodn. nonideality, and the osmotic second virial coefficient of the aqueous osmolytes. Finally, we provided an outlook on how the proposed approach could guide the quest for a truly (microstructural to free energy) causative explanation for the denaturation mechanism of proteins.

Journal of Physical Chemistry B published new progress about Free energy. 598-50-5 belongs to class isoquinoline, name is 1-Methylurea, and the molecular formula is C2H6N2O, COA of Formula: C2H6N2O.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yang, Xiaoqing published the artcileDeep eutectic solvents consisting of EmimCl and amides: Highly efficient SO2 absorption and conversion, Name: 1-Methylurea, the main research area is emimcl amide deep eutectic solvent sulfur dioxide absorption conversion; deep eutectic solvent sulfur dioxide absorption phase transfer complex.

There has been a surge in interest and research in the arena of utilizing deep eutectic solvents (DESs) as green solvents for removal of SO2 in recent years. In this work, an effective strategy for SO2 reversible capture and fixation by four amides based DESs was demonstrated. These DESs are composed of 1-ethyl-3-methylimidazolium chloride (EmimCl) and dimethylurea (DMU), N-methylurea (MU), thioacetamide (SAA), or caprolactam (CLAA) in a 2:1 M ratio, which achieve both high gravimetric and molar absorption capacity of SO2 at 20°C and 1.0 bar (up to 1.26 g per g of DES, or 8.00 mol per mol of DES). Results of the NMR and FTIR spectra reveal that there are phys. interactions between SO2 and DESs. Furthermore, absorbed SO2 can be desorbed and no significant drop in SO2 absorption was observed after five successive absorption-desorption cycles. Particularly, the absorbed SO2 was quickly converted in situ into the charge-transfer complex of bis(sulfur dioxide)-1,4-diazabicyclo[2.2.2]octane adduct (DABCO·2SO2) as a high value-added chem. The SO2-lean phase was directly reused for SO2 capture, thus greatly reducing energy requirements and providing a promising method SO2 resource utilization.

Separation and Purification Technology published new progress about Absorbents. 598-50-5 belongs to class isoquinoline, name is 1-Methylurea, and the molecular formula is C2H6N2O, Name: 1-Methylurea.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Shi, Wei published the artcileComputational Screening of Physical Solvents for CO2 Pre-combustion Capture, Name: 1-Methylurea, the main research area is computational screening solvent carbon dioxide absorption precombustion.

A computational scheme was used to screen phys. solvents for CO2 pre-combustion capture by integrating the com. NIST database, an inhouse computational database, chem-informatics, and mol. modeling. A com. available screened hydrophobic solvent, di-Et sebacate, was identified from the screening with favorable phys. properties and promising absorption performance. The promising performance to use di-Et sebacate in CO2 pre-combustion capture has also been confirmed from experiments Water loading in di-Et sebacate is very low, and therefore, water is kept with H2 in the gas stream. The favorable CO2 interaction with di-Et sebacate and the intermediate solvent free volume fraction leads to both high CO2 solubility and high CO2/H2 solubility selectivity in di-Et sebacate. An inhouse NETL computational database was built to characterize CO2, H2, N2, and H2O interactions with 202 different chem. functional groups. It was found that 13% of the functional groups belong to the strong interaction category with the CO2 interaction energy between -15 and -21 kJ/mol; 62% of the functional groups interact intermediately with CO2 (-8 to -15 kJ/mol). The remaining 25% of functional groups interact weakly with CO2 (below -8 kJ/mol). In addition, calculations show that CO2 interactions with the functional groups are stronger than N2 and H2 interactions but are weaker than H2O interactions. The CO2 and H2O interactions with the same functional groups exhibit a very strong linear pos. correlation coefficient of 0.92. The relationship between CO2 and H2 gas solubilities and solvent fractional free volume (FFV) has been systematically studied for seven solvents at 298.2 K. A skewed bell-shaped relation was obtained between CO2 solubility and solvent FFV. When an organic compound has a d. approx. 10% lower than its d. at 298.2 K and 1 bar, it exhibits the highest CO2 loading at that specific solvent d. and FFV. Note that the solvent densities were varied using simulations, which are difficult to be obtained from the experiment In contrast, H2 solubility results exhibit an almost perfect pos. linear correlation with the solvent FFV. The theor. maximum and min. phys. CO2 solubilities in any organic compound at 298.2 K were estimated to be 11 and 0.4 mol/MPa L, resp. An examination of 182 exptl. CO2 phys. solubility data and 29 simulated CO2 phys. solubilities shows that all the CO2 phys. solubility data are within the maximum and min. with only a few exceptions. Finally, simulations suggest that in order to develop phys. solvents with both high CO2 solubility and high CO2/H2 solubility selectivity, the solvents should contain functional groups which are available to interact strongly with CO2 while minimizing FFV.

Journal of Physical Chemistry B published new progress about Absorbents. 598-50-5 belongs to class isoquinoline, name is 1-Methylurea, and the molecular formula is C2H6N2O, Name: 1-Methylurea.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Ding, Hongliang published the artcileHighly flame retardant, low thermally conducting, and hydrophobic phytic acid-guanazole-cellulose nanofiber composite foams, Formula: C2H5N5, the main research area is phytic acid guanazole cellulose nanofiber composite foam.

Cellulose as a bio-based material has attracted increasing attention due to its excellent properties. However, cellulose is very flammable and it is necessary to impart flame retardancy to cellulose nanofiber (CNF) foams. In this work, phytic acid (PA)-guanazole (GZ)-CNF composite foams were prepared by a simple freeze-drying method. SEM images indicated that the resultant PA-GZ-CNF composite foams exhibited a hierarchical porous structure. Moreover, the introduction of PA and GZ slightly affected the thermal conducting property of CNF foams. PA-GZ-CNF composite foams possessed excellent flame retardancy with a much higher LOI value and a UL-94 V-0 rating compared to that of pure CNF foams. Moreover, the peak of the heat release rate of PA-GZ-CNF composite foams exhibited a significant decrease from 57.80 to 29.27 kW/m2 and the total heat release declined from 2.10 to 1.21 MJ/m2. PA-GZ-CNF composite foams formed a protective char layer covered on the surface, which produced less thermal decomposition volatiles and prevented the spread of pyrolysis products into the gas phase. Addnl., PA-GZ-CNF composite foams achieved hydrophobicity with a water contact angle of 104.0° after hydrophobic treatment without sacrificing their flame retardancy.

Cellulose (Dordrecht, Netherlands) published new progress about Absorption. 1455-77-2 belongs to class isoquinoline, name is 3,5-Diamino-1,2,4-triazole, and the molecular formula is C2H5N5, Formula: C2H5N5.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem