505-86-2Relevant articles and documents
Simple process for the preparation of cetyltrimethylammonium naproxenate (naprocet)
Bolchi, Cristiano,Valoti, Ermanno,Fumagalli, Laura,Ruggeri, Paola,Straniero, Valentina,Pallavicini, Marco
, p. 976 - 979 (2014)
Specifications for cetyltrimethylammonium (CTA) naproxenate (naprocet), the active ingredient of pharmaceutical liquid preparations used as antiseptic-antinflammatory detergents, fix severe limits to the presence of residual inorganic counteranion deriving from the starting CTA salt. A new simple procedure, which avoids ionic exchange chromatography and utilizes CTAHSO4 in place of CTABr and CTACl, exploits the quantitative precipitation of K2SO4 from methanol to yield naprocet in line with such specification requirements.
Formation of a lanthanoid complex shell on a nanoparticulate wax core
Akturk, Eser,Kim, Joo-Hyung,Koppolu, Sujeethraj,Roth, Eric,Walters, Marc A.
, (2020)
Carboxylate-rich lanthanide complexes were employed as anion counterions to the cationic surfactant cethyltrimethylammonium (CTA) and assembled to form a shell around emulsifying wax nanoparticles. The anionic complexes consisted of lanthanide ions coordinated by the ligand DOTA-tetrahomoserine (DhS). In combination with CTA the complexes formed a surfactant system (CTA)[LnDhS] (Ln = Eu, Gd) with the nonpolar tail of CTA embedded in an emulsifying wax (EW) nanoparticle core. The DhS units were then crosslinked with divinylsulfone to form a shell around the EW core. Fluorescence and NMR data on the Eu complex were consistent with the formation of a stable polymeric shell around the wax core template. These results illustrate a general method that exploits electrostatic interactions to assemble capsules around solid lipid nanoparticles. Preliminary relaxivity measurements were carried out on particles with Gd-containing shells.
Counter cation dependent and stimuli responsive supramolecular polymers constructed by calix[4]pyrrole based host–guest interactions
Yuvayapan, Samet,Aydogan, Abdullah
, p. 633 - 639 (2019)
Carboxylate tethered calix[4]pyrroles in the form of their tetrabutylammonium (TBA) and cetyltrimethylammonium (CTA) salts were synthesized via an acid base reaction between the corresponding carboxylic acid functionalized calix[4]pyrrole and tetrabutyl-or cetyltrimethylammonium hydroxide. The host–guest recognition motif based on these calix[4]pyrrole macrocycles and tethered carboxylate units was employed to construct novel A–B type supramolecular polymers from low molecular weight monomers in chloroform. These supramolecular polymers were found to be dependent on the counter cation in terms of the properties of supramolecular polymers.1H-, DOSY-, NOESY-NMR spectroscopic analyses, viscosity measurements, and SEM results were used to characterize supramolecular polymers and revealed that the CTA cation becomes a direct part of supramolecular polymer via cation–π interactions between the ammonium part of CTA and carboxylate-bound calix[4]pyrrole, effecting the overall properties of supramolecular polymers such as viscosity, gel formation, and drawing fibers. Additionally, reversible pH-and thermo-responsiveness of the supramolecular polymers were demonstrated for the first time for an anion recognition induced calix[4]pyrrole based supramolecular polymer.
Electron-Transfer Equilibria and Kinetics of N-Alkylphenothiazines in Micellar Systems
Pelizetti, Ezio,Fisicaro, Emilia,Minero, Claudio,Sassi, Alberto,Hidaka, Hisao
, p. 761 - 766 (1991)
The kinetics and equilibria of electron transfer between N-alkylphenothiazines (alkyl = methyl, ethyl, butyl, dodecyl) and aquoiron (III)/(II) in the presence of various micellar forming surfactants (hexadecyltrimethylammonium methanesulfonate, sodium dodecylsulfate, and Triton X(100) were investigated.The presence of the micelles strongly affects rates and equilibria, and the dependence of these changes on the hydrophobicity of the alkyl chain is examined.
Synthesis of two chiral surfactants by a simple method and the surface activity evaluation
Bai, Yun,Chen, Gang,Dong, Sanbao,Liu, Dengwei,Qu, Chengtun,Yan, Jiao,Zhang, Jie,Zhu, Shidong
, (2020)
In order to expand the application range of surfactants, two chiral surfactants named CTACYT and CTATYS were synthesized by reacting cetyltrimethylammonium chloride (CTAC) with L-cysteine and L-tyrosine, respectively by a simple method. Studies show that the foaming ability, foam stability and emulsifying properties of both CTACYT and CTATYS are superior to CTAC. The corrosion inhibition efficiencies of CTACYT and CTATYS are 96.72% and 90.22%, respectively, which are higher than that of CTAC. The new chiral surfactants remain the chiral character, and the specific optical rotations of CTACYT and CTATYS were 8.1° and 11.6°, respectively. This work provides a new and easy way to the synthesis of chiral surfactants, which will benefit the related research in this field.
A new approach to the phase behavior of oppositely charged polymers and surfactants
Svensson, Anna,Piculell, Lennart,Cabane, Bernard,Ilekti, Philippe
, p. 1013 - 1018 (2002)
The complex salt (ionic surfactant + polymeric counterion) cetyltrimethylammonium polyacrylate (CTAPA) has been synthesized, and its aqueous mixtures with cetyltrimethylammonium bromide (CTABr) have been studied. These mixtures differ from conventional oppositely charged polymer/surfactant mixtures in that the conventional counterion of the polyion (usually sodium, for the polyacrylate) is absent, which simplifies the studies and their interpretation considerably. The phase diagram of the CTAPA/CTABr/water system at > 20 wt % water and at 40 ?°C has been established, representing the first truly ternary phase diagram of an oppositely charged polymer/surfactant pair in water. The two dimensions of the phase diagram may be chosen as the water content (in weight percent) and the fraction of bromide counterions, xBr (in units of charge equivalents). The phase diagram is characterized by a large hexagonal phase (at low water contents and for all values of xBr), a small cubic phase (at 55 wt % water content and for xBr Br > 0.9), and a large multiphase region (at water contents >50 wt %) containing two or three of the cubic, hexagonal, or isotropic phases in coexistence. The cubic and hexagonal phases are connected to the corresponding phases that separate out from aqueous NaPA/CTABr mixtures. The maximum water uptake of the hexagonal phase is remarkably constant at ca. 50 wt % over a large CTAPA/CTABr composition range (xBr 0.9). The study confirms previous conclusions that the polyacrylate counterions favor a higher aggregate curvature (leading to smaller aggregates) than do the bromide counterions.
Preparation of Acifluorfen-Based Ionic Liquids with Fluorescent Properties for Enhancing Biological Activities and Reducing the Risk to the Aquatic Environment
Cao, Yongsong,Li, Jianqiang,Niu, Junfan,Tang, Gang,Tang, Jingyue,Tang, Rong,Yang, Jiale,Zhang, Wenbing,Zhou, Zhiyuan
, p. 6048 - 6057 (2020/06/26)
In this work, 12 novel herbicidal ionic liquids (HILs) based on acifluorfen were prepared by pairing with the fluorescent hydrazides or different alkyl chains for increasing activities and reducing negative impacts on the aquatic environment. The results showed that the fluorescence of coumarin hydrazide in the HILs was applied as the internal and supplementary light source to meet the requirement of light wavelength range of acifluorfen, which improved the phytotoxicity of acifluorfen to weeds by enhancing singlet oxygen generation with increased sunlight utilization. The herbicidal activities of HILs were related positively with the length of chain of cation under high light intensity and depended mainly on the fluorescence characteristic of the cation under low light intensity, and the double salt IL forms of acifluorfen containing coumarin hydrazide and n-hexadecyltrimethylammonium had enhanced efficacies against broadleaf weeds in the field. Compared with acifluorfen sodium, HILs had lower water solubility, better surface activity, weaker mobility in soils, and higher decomposition temperature. These results demonstrated that HILs containing different cations provided a wider scope for fine-tuning of the physicochemical and biological properties of herbicides and established a promising way for the development of environmentally friendly herbicidal formulations.
Highly efficient roomerature phosphorescence achieved by gadolinium complexes
Sun, Boxun,Wei, Chen,Wei, Huibo,Cai, Zelun,Liu, Huanyu,Zang, Zhiyu,Yan, Wenchao,Liu, Zhiwei,Bian, Zuqiang,Huang, Chunhui
supporting information, p. 14958 - 14961 (2019/10/22)
A new family of room temperature phosphorescent materials with emission lifetimes in microseconds has been reported in this work. Phosphorescence of gadolinium complexes with emission color from blue to orange has been obtained at room temperature with a maximum photoluminescence quantum yield of 66%, benefiting from appropriate molecular structures and favorable encapsulation methods.
Energy efficient Pfitzinger reaction: A novel strategy using a surfactant catalyst
More, Priyanka A.,Shankarling, Ganapati S.
supporting information, p. 12380 - 12383 (2017/11/06)
A novel energy efficient method for the Pfitzinger reaction is demonstrated, which is catalysed using a surfactant, cetyltrimethylammonium hydroxide. The surfactant nature of the catalyst caused the substrate to be soluble in aqueous media, which enhanced the interaction of the catalyst with the substrate. An increase in the rate of reaction and more than 78% of energy saving were observed under ultrasonic irradiation.
Quaternary ammonium salt type perrhenate ionic liquid and synthetic method and application thereof
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Paragraph 0026, (2017/06/02)
The invention discloses quaternary ammonium salt type perrhenate ionic liquid and a synthetic method and application thereof. The method comprises the steps that alkyl ammonium bromide and KOH are reacted to obtain quaternary ammonium base, the quaternary ammonium base and perrhenate (NH4ReO4) metal salt are subjected to a replacement reaction, and quaternary ammonium salt type perrhenate ionic liquid is obtained. The synthesized quaternary ammonium salt type perrhenate ionic liquid is a pollution-free catalyst, has catalysis activity for lignocellulose, can be used as the catalyst for degrading lignocellulose to prepare reducing sugar, and the high yield is obtained.
