نتایج جستجو برای: quaternary phosphonium

تعداد نتایج: 15248  

2015
Konstantza Tonova Ivan Svinyarov Milen G. Bogdanov

Ionic liquids consisting of a phosphonium cationic moiety and a saccharinate anion are synthesized and compared with their precursors, phosphonium chlorides, in reference to their extraction efficiency towards L-lactic acid. On the base of measurements of the acid and the water partitioning in the equilibrium biphasic systems, the molar ratios between acid, water and ionic liquid are estimated ...

Journal: :Journal of Molecular Liquids 2022

The thermal stability of ionic liquids is important for their use in a variety applications. Here, reactive molecular dynamics simulations and thermogravimetric analyses were used to explore the decomposition mechanisms phosphonium salicylate benzoate. Experiments performed at different heating rates indicated that temperatures benzoate comparable, but was less stable than under isothermal high...

Journal: :Advanced photonics 2022

Materials that exhibit visible luminescence upon X-ray irradiation show great potential in the medical and industrial fields. Pure organic materials have recently emerged as promising scintillators for detection radiography, due to their diversified design, low cost, facile preparation. However, recent progress efficient radioluminescence has mainly focused on small molecules, which are inevita...

Journal: :Soft matter 2016
Gregory P Sorenson Mahesh K Mahanthappa

Arising from the water-driven self-assembly of amphiphiles over generally narrow temperature and composition phase windows, aqueous lyotropic liquid crystal (LLC) network phases are useful in applications as therapeutic delivery vehicles and templates for mesoporous material syntheses. While a clear set of amphiphile design rules that enables access to these intricate three-dimensional structur...

Journal: :Biotechnology progress 2013
Carlos F C Marques Teresa Mourão Catarina M S S Neves Alvaro S Lima Isabel Boal-Palheiros João A P Coutinho Mara G Freire

Aqueous biphasic systems (ABS) using ionic liquids (ILs) offer an alternative approach for the extraction, recovery, and purification of biomolecules through their partitioning between two aqueous liquid phases. In this work, the ability of a wide range of ILs to form ABS with aqueous solutions of Na2 CO3 was evaluated. The ABS formed by IL + water + Na2 CO3 were determined at 25°C, and the res...

Journal: :Physical chemistry chemical physics : PCCP 2015
Ai Lien Ong Kenneth K Inglis Daniel K Whelligan Sam Murphy John R Varcoe

This study investigates the effect of 1 mmol dm(-3) concentrations of a selection of small cationic molecules on the performance of a fuel cell grade oxygen reduction reaction (ORR) catalyst (Johnson Matthey HiSPEC 3000, 20 mass% Pt/C) in aqueous KOH (1 mol dm(-3)). The cationic molecules studied include quaternary ammonium (including those based on bicyclic systems) and imidazolium types as we...

Journal: :Biochimica et biophysica acta 2010
Denice C Bay R Arief Budiman Mu-Ping Nieh Raymond J Turner

Escherichia coli multidrug resistance protein E (EmrE) is a four transmembrane alpha-helix protein, and a member of the small multidrug resistance protein family that confers resistance to a broad range of quaternary cation compounds (QCC) via proton motive force. The multimeric states of EmrE protein during transport or ligand binding are variable and specific to the conditions of study. To ex...

Journal: :Chemical communications 2010
Alexander J M Miller John E Bercaw

Bulky tertiary phosphine/borane Lewis pairs P(t)Bu(3)/B(C(6)F(5))(3) react with amine-boranes to afford dehydrocoupling products and phosphonium borohydride salts.

Journal: :Organic & biomolecular chemistry 2014
Attila Vörös Zoltán Mucsi Zoltán Baán Géza Timári István Hermecz Péter Mizsey Zoltán Finta

The industrially relevant reaction between nitriles and hydroxylamine yielding amidoximes was studied in different molecular solvents and in ionic liquids. In industry, this procedure is carried out on the ton scale in alcohol solutions and the above transformation produces a significant amount of unexpected amide by-product, depending on the nature of the nitrile, which can cause further analy...

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