5204-74-0Relevant articles and documents
Study on absorption and spectral properties of H2S in carboxylate protic ionic liquids with low viscosity
Zhao, Tianxiang,Li, Ping,Feng, Xi,Hu, Xingbang,Wu, Youting
, p. 806 - 813 (2018)
The exorbitant price and high viscosity are two major disadvantages for ionic liquids (ILs), which influence their practical applications in gas separation. Here we synthesized ten carboxylate protic ionic liquids (PILs), containing N-ethylmorpholine acetate, N-ethylmorpholine propionate, N-ethylmorpholine butyrate, N-ethylmorpholine methoxylacetate, 4-(2-hydroxyethyl) morpholine acetate, and 4-(2-hydroxyethyl) morpholine methoxyacetate, triethylamine acetate, triethylamine propionate, triethylamine propionate, and triethylamine methoxylacetate, with low cost and viscosity for absorption of H2S. The densities and viscosities of these carboxylate PILs were measured in the temperature range of (298.2 to 333.2) K at atmospheric pressure. The solubility of H2S in these PILs was determined using an isochoric saturation technique at 298.2–318.2 K and 0–1.096 bar. It was found that the solubility of H2S in these PILs increased with the increasing pressure and length of the alkyl chains on the carboxylic acid. The absorption processes obeyed Henry's law within the given experimental conditions and Henry's constants were calculated from solubility data. In addition, the FTIR and NMR spectral properties in the absorption process of H2S in N-ethylmorpholine butyrate [NEMH][Bu] also were investigated to present important information on absorption mechanism. The results indicated that [NEMH][Bu] demonstrated a highest absorption capacity among these PILs and absorption of H2S is a physical behavior. Comparisons of PILs with the common ILs and organic solvents were also done to demonstrate the advantages of PILs.
Peptides in aqueous protic ionic liquid solutions: Apparent and transfer volumes at 298.15 K and at 0.1 MPa
Dagade, Dilip H.,Musale, Shrikant P.,Patil, Kunal R.
, (2020)
The densities of glycine based peptides namely glycyl-glycine (digly), glycine-?-valine (gly-val), glycyl-?-leucine (gly-leu) and glycyl-glycyl-glycine (triglycine/trigly) in aqueous solutions containing ~0.20 mol·kg?1 of triethylammonium acetate [TEAA], triethylammonium glycolate [TEAG], triethylammonium pyruvate [TEAPy] and triethylammonium propionate [TEAP] protic ionic liquids (PILs) are reported at 298.15 K and at atmospheric pressure. Experimental density data obtained for these systems were used to estimate apparent molar volume (?V), the limiting apparent molar volume (?V0), partial molar volume of solute (Vˉ2) and partial molar volume of mixed solvent (PILs + water) (Vˉ1). The change in limiting apparent molar volume due to transfer (Δtr?V0) of peptides from water to aqueous ionic liquid solutions were also estimated. The outcomes obtained from all these thermodynamic parameters were discussed in terms of ion–peptide interactions, ion–ion interactions, hydrophobic solvation, peptide group contributions to limiting volumes, etc.
Synthesis and potent antimicrobial activity of novel coumarylthiazole α-aminophosphonates derivatives
Boukhari, Abbes,Cheraiet, Zinelaabidine,Djahoudi, Abdelghani,Litim, Bilal,Meliani, Saida
, (2021/06/16)
Abstract: Herein, we reported a novel series of?α-aminophosphonates derivatives (IV)a–m bearing an important pharmacophore coumarylthiazole moiety. All the new compounds have been synthesized?via?Kabachnik–Fields reaction under ultrasonic irradiation. The products were obtained in good yield with a simple workup and were confirmed using various spectroscopic methods. All these compounds (IV)a–m were screened for their in vitro for antimicrobial activity against thirteen Gram-negative bacteria and five Gram-positive bacteria and Candida albicans strains. The results showed that all the synthesized compounds exhibited moderate antibacterial activities against both references and multidrug-resistant and antifungal strains. The compound?(IV)e?showed the highest activities against all pathogens of the tested microbial strains with?MIC of 0.125?μg/mL.?The compounds (IV)h, (IV)f, (IV)b, and (IV)d exhibited moderate and promising activities with MIC of 0.125?μg/mL. Structure–activity relationship revealed that inhibitory activity of the synthesized compounds is related to the type of the substituted group on phenyl rings, and these results showed that the electron-donating groups at?ortho?and?para?positions have a high relationship increasing antimicrobial activities than the electron‐withdrawing groups. These results confirm that coumarylthiazole α-aminophosphonates compounds can be potential antimicrobial drugs candidate. Graphic abstract: [Figure not available: see fulltext.].
QUINONE METHIDE AND AMMONIUM SALT ANTIPOLYMERANT COMPOSITION AND METHOD
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Paragraph 164-165, (2021/04/17)
Described are compositions and methods for inhibiting polymerization of a monomer (e.g., styrene) composition a quinone methide polymerization retarder and an ammonium salt. In a mixture, the ammonium salt improves the efficacy of the quinone methide polymerization retarder and provides greater antipolymerant activity. In turn, the mixture reduces or prevents apparatus fouling and improves the purity of monomer streams.
