Extraction of alkali metal cations into polyester-based polyurethane foam using crown ether and picric acid

1987 ◽  
Vol 65 (5) ◽  
pp. 1103-1108 ◽  
Author(s):  
A. S. Khan ◽  
W. G. Baldwin ◽  
A. Chow
Keyword(s):  
Aqueous Solution ◽  
Crown Ether ◽  
Alkali Metal ◽  
Polyurethane Foam ◽  
Alkali Metals ◽  
Picric Acid ◽  
Ion Pair ◽  
Alkali Metal Cations ◽  
Degree Of Extraction ◽  
Cation Size

The distribution of alkali metal picrates between water and polyester-based polyurethane foam in the presence of dicyclohexyl-18-crown-6 was studied. The order of extraction coefficients of the alkali metals is governed by the ratio of the cation size to that of the crown ether, although the degree of extraction may depend on the nature of the organic phase. The extraction of alkali metals by polyurethane foam from an aqueous solution in the presence of crown ether and a bulky anion can be considered as an ion pair extraction of MCrA by an organic solvent.

The extraction of alkali metal picrates by polyurethane foam using crown ether

1981 ◽  
Vol 59 (10) ◽  
pp. 1490-1496 ◽  
Author(s):  
Anjum S. Khan ◽  
W. G. Baldwin ◽  
A. Chow
Keyword(s):  
Crown Ether ◽  
Alkali Metal ◽  
Polyurethane Foam ◽  
Dissociation Constants ◽  
Extraction Constant ◽  
Ion Pair ◽  
Constant Sequence ◽  
Extraction Constants ◽  
The Stability ◽  
Ether Complex

The distribution of alkali metal picrates between water and polyurethane foam was studied in the presence of dicyclohexyl 18-crown-6 (DCHC-6). The extraction constants and dissociation constants for the ion pair (MCrA) in polyurethane foam were determined. The extraction constant sequence of the alkali metal ions with DCHC-6 is K+ > Rb+ > Cs+ > Na+ and mainly depends on the stability of the alkali metal – crown ether complex.

The Influence of Alkali Metal Cation Size on the Formation and Dissociation of Crown Ether Fullerene Dimers in Electrospray Mass Spectrometry

2015 ◽  
Vol 120 (1) ◽  
pp. 786-792 ◽  
Author(s):  
Ina D. Kellner ◽  
Marc S. von Gernler ◽  
Manolis D. Tzirakis ◽  
Michael Orfanopoulos ◽  
Thomas Drewello
Keyword(s):  
Mass Spectrometry ◽  
Crown Ether ◽  
Alkali Metal ◽  
Metal Cation ◽  
Electrospray Mass Spectrometry ◽  
Alkali Metal Cation ◽  
Fullerene Dimers ◽  
Cation Size

Emergence of Symmetry and Chirality in Crown Ether Complexes with Alkali Metal Cations

2010 ◽  
Vol 114 (26) ◽  
pp. 7048-7054 ◽  
Author(s):  
Bruno Martínez-Haya ◽  
Paola Hurtado ◽  
Ana R. Hortal ◽  
Said Hamad ◽  
Jeffrey D. Steill ◽  
...  
Keyword(s):  
Crown Ether ◽  
Alkali Metal ◽  
Metal Cations ◽  
Alkali Metal Cations ◽  
Crown Ether Complexes

Selective column concentration of alkali-metal cations with a crown ether carboxylic acid resin

1991 ◽  
Vol 63 (17) ◽  
pp. 1844-1847 ◽  
Author(s):  
Takashi. Hayashita ◽  
Joung Hae. Lee ◽  
Shiping. Chen ◽  
Richard A. Bartsch
Keyword(s):  
Carboxylic Acid ◽  
Crown Ether ◽  
Alkali Metal ◽  
Metal Cations ◽  
Alkali Metal Cations ◽  
Acid Resin

Reaction between alkali metal ferrocyanides and persulfates in aqueous solution

1967 ◽  
Vol 45 (20) ◽  
pp. 2411-2418 ◽  
Author(s):  
R. W. Chlebek ◽  
M. W. Lister
Keyword(s):  
Aqueous Solution ◽  
Alkali Metal ◽  
Rate Constants ◽  
Ion Pairs ◽  
Metal Cations ◽  
Activation Energies ◽  
Alkali Metal Cations ◽  
Potassium Salts ◽  
Apparent Activation Energies

The rates of the reaction of ferrocyanide and persulfate ions, in the presence of various concentrations of different alkali metal cations, have been measured at various temperatures and ionic strengths. The results are interpreted in terms of ion pairs and support the view that the actual reacting species are MFe(CN)6−3 and MS2O8−, where M is an alkali metal. This is similar to the situation found earlier for potassium salts of these ions. The rate constants obtained on this assumption increase gradually from lithium to cesium. Values are also obtained for the apparent activation energies of these reactions.

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