Fabrication of a GUMBOS-based acid–base indicator: smart probe for sensing acids and bases in any solvent

2020 ◽  
Vol 22 (48) ◽  
pp. 28045-28054
Author(s):  
Prabal Pramanik ◽  
Rajkumar Sahoo ◽  
Sudhir Kumar Das ◽  
Mintu Halder
Keyword(s):  
Ionic Liquid ◽  
Dissociation Constants ◽  
Ph Responsive ◽  
Acid Base ◽  
Polar Solvents ◽  
Polar Media ◽  
Acids And Bases

This report outlines the synthesis of an ionic liquid-based pH-responsive indicator to sense acids or bases in non-polar as well as polar solvents. This has further scope to investigate the dissociation constants of several acids in non-polar media.

scholarly journals Complexation of 2,6-helic[6]arene and its derivatives with 1,1′-dimethyl-4,4′-bipyridinium salts and protonated 4,4'-bipyridinium salts: an acid–base controllable complexation

2019 ◽  
Vol 15 ◽  
pp. 1795-1804 ◽  
Author(s):  
Jing Li ◽  
Qiang Shi ◽  
Ying Han ◽  
Chuan-Feng Chen
Keyword(s):  
Association Constants ◽  
The Other ◽  
Acid Base ◽  
Polar Solvents ◽  
X Ray ◽  
H Nmr ◽  
Hydrogen Bonding Interactions ◽  
Acids And Bases ◽  
Multiple Hydrogen Bonding ◽  
Nmr Titrations

2,6-Helic[6]arene and its derivatives were synthesized, and their complexation with 1,1′-dimethyl-4,4′-bipyridinium and protonated 4,4'-bipyridinium salts were investigated in detail. It was found that the helic[6]arene and its derivatives could all form 1:1 complexes with both 1,1′-dimethyl-4,4'-bipyridinium salts and protonated 4,4'-bipyridinium salts in solution and in the solid state. Especially, the helic[6]arene and its derivatives containing 2-hydroxyethoxy or 2-methoxyethoxy groups exhibited stronger complexation with the guests than the other helic[6]arene derivatives for the additional multiple hydrogen bonding interactions between the hosts and the guests, which were evidenced by 1H NMR titrations, X-ray crystal structures and DFT calculations. Moreover, it was also found that the association constants (K a) of the complexes could be significantly enhanced with larger counteranions of the guests and in less polar solvents. Furthermore, the switchable complexation between the helic[6]arene and protonated 4,4'-bipyridinium salt could be efficiently controlled by acids and bases.

scholarly journals Extraction of Acids and Bases from Aqueous Phase to a Pseudoprotic Ionic Liquid

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 894 ◽  
Author(s):  
Nikolas Patsos ◽  
Karin Lewis ◽  
Francesco Picchioni ◽  
Mark Kobrak
Keyword(s):  
Ionic Liquid ◽  
Aqueous Phase ◽  
Octanoic Acid ◽  
Organic Layer ◽  
Current Interest ◽  
Acid Base ◽  
Copper Salts ◽  
Hofmeister Effect ◽  
Wide Range ◽  
Acids And Bases

We report experiments on the extraction of acids and bases from an aqueous phase to a pseudoprotic ionic liquid phase consisting of an equimolar mixture of trihexylamine and octanoic acid. We observed the extraction of a wide range of acids and bases, and investigated the mechanism of extraction in detail. Our results confirmed the observation of the Hofmeister effect in these systems reported in our previous work, where the extent of the extraction of copper salts was significantly influenced by the interactions between extracted inorganic anions and the organic phase. Our results further demonstrated that the organic layer served as a “floating buffer” capable of stabilizing the pH of an acidic or alkaline aqueous phase. The results tie current interest in protic and pseudoprotic ionic liquids to earlier work on the extraction of acids using amine and acid–base couples as extraction agents in an inert organic solvent.

THE SULPHURIC ACID SOLVENT SYSTEM: PART I. ACID-BASE REACTIONS

1960 ◽  
Vol 38 (8) ◽  
pp. 1363-1370 ◽  
Author(s):  
R. H. Flowers ◽  
R. J. Gillespie ◽  
E. A. Robinson
Keyword(s):  
Electrical Conductivity ◽  
Sulphuric Acid ◽  
Dissociation Constants ◽  
Solvent System ◽  
Conductivity Measurements ◽  
Acid Base ◽  
Acid And Base ◽  
System Part ◽  
Acids And Bases ◽  
Good Agreement

Acid–base reactions in the solvent sulphuric acid are discussed. Such reactions are conveniently studied by electrical conductivity measurements. A relation between the composition at which the conductivity has a minimum value and the strengths of the acid and base is derived. Values of the dissociation constants of acids and bases obtained in this way are shown to be in good agreement with values obtained by other methods.

Acid-base properties of 1,3-diphenyl-5-(1H-tetrazol-2-yl)formazan and 1,3-diphenyl-5-(2H-1,2,4-triazol-3-yl)formazan

1982 ◽  
Vol 47 (11) ◽  
pp. 2882-2889
Author(s):  
Nadezhda Likhareva ◽  
Ladislav Šůcha ◽  
Miloslav Suchánek
Keyword(s):  
Computer Program ◽  
Dissociation Constants ◽  
Acid Base ◽  
New Compounds ◽  
Base Properties

Two new compounds from the formazan series, viz. 1,3-diphenyl-5-(1H-tetrazol-2-yl)formazan and 1,3-diphenyl-5-(2H-1,2,4-triazol-3-yl)formazan, were prepared, and the dissociation constants and molar absorptivities of all of their acid-base species were determined spectrophotometrically employing the SPEKTFOT computer program.

Solvation and redox properties of [Co(en)3]3+-[Co(en)3]2+ system

1980 ◽  
Vol 45 (2) ◽  
pp. 335-338 ◽  
Author(s):  
Adéla Kotočová ◽  
Ulrich Mayer
Keyword(s):  
Hydrogen Bond ◽  
Lewis Acid ◽  
Specific Interaction ◽  
Redox Properties ◽  
Solvation Effect ◽  
Interacting Particles ◽  
Acid Base ◽  
Polar Solvents ◽  
Oxidation Reduction ◽  
Solvent Molecules

The solvation effect of a number of nonaqueous polar solvents was studied on the oxidation-reduction properties of the [Co(en)3]3+-[Co(en)3]2+ system. Interactions of these ions with the solvent molecules are discussed in terms of their coordination, which is accompanied by a specific interaction of the Lewis acid-base type, namely formation of a hydrogen bond between the interacting particles. This is the main controlling factor of the redox properties of the studied system.

Acids, bases and buffer solutions

2018 ◽  
Author(s):  
Dennis Sherwood ◽  
Paul Dalby
Keyword(s):  
First Principles ◽  
Buffer Capacity ◽  
Unique Feature ◽  
Dissociation Constants ◽  
Equilibrium Composition ◽  
Buffer Solutions ◽  
Acid And Base ◽  
Water Ph ◽  
Acids And Bases ◽  
Conjugate Bases

Many reactions in solution involve acids and bases, and so this chapter examines these important reactions in detail. Topics covered include the ionisation of water, pH, pOH, acids and bases, conjugate acids and conjugate bases, acid and base dissociation constants, the Henderson-Hasselbalch equation, the Henderson-Hasselbalch approximation, buffer solutions and buffer capacity. A unique feature of this chapter is a ‘first principles’ analysis of how a reaction buffered at a particular pH achieves an equilibrium composition different from that of the same reaction taking place in an unbuffered solution. This introduces some concepts which are important in understanding the biochemical standard state, as required for Chapter 23.

Incorporation of linear poly(ionic liquid)s inside acid-base dualistic carbons for CO2 cycloaddition reaction

2021 ◽  
Vol 52 ◽  
pp. 101702
Author(s):  
Nanhua Wu ◽  
Yifeng Zou ◽  
Rong Xu ◽  
Jing Zhong ◽  
Jing Li
Keyword(s):  
Ionic Liquid ◽  
Cycloaddition Reaction ◽  
Acid Base ◽  
Linear Poly ◽  
Poly Ionic Liquid
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