Extraction of alkaline earth cations from aqueous solutions by crown ether carboxylic acids

1981 ◽  
Vol 53 (14) ◽  
pp. 2247-2250 ◽  
Author(s):  
Jerzy. Strzelbicki ◽  
Richard A. Bartsch
Keyword(s):  
Crown Ether ◽  
Aqueous Solutions ◽  
Carboxylic Acids ◽  
Alkaline Earth ◽  
Alkaline Earth Cations

Transport of alkali and alkaline earth cations by a crown ether-alkylphosphoric acid system

1993 ◽  
Vol 2 (4) ◽  
pp. 295-299 ◽  
Author(s):  
Toshio Takahashi ◽  
Yoichi Habata ◽  
Tetsuyuki Okumachi
Keyword(s):  
Crown Ether ◽  
Alkaline Earth ◽  
Acid System ◽  
Alkylphosphoric Acid ◽  
Alkaline Earth Cations

Spectrophotometric study of the complexation reactions between alkaline earth cations and murexide in some non-aqueous solutions

Polyhedron ◽  
1988 ◽  
Vol 7 (14) ◽  
pp. 1227-1230 ◽  
Author(s):  
Soheila Kashanian ◽  
Mohammad Bagher Gholivand ◽  
Siavash Madaeni ◽  
Alireza Nikrahi ◽  
Mojtaba Shamsipur
Keyword(s):  
Aqueous Solutions ◽  
Alkaline Earth ◽  
Spectrophotometric Study ◽  
Complexation Reactions ◽  
Alkaline Earth Cations

Micelle formation as a factor influencing the mode(s) of metal ion partitioning into N-alkylpyridinium-based ionic liquids (ILs): implications for the design of IL-based extraction systems

2017 ◽  
Vol 19 (23) ◽  
pp. 5674-5682 ◽  
Author(s):  
James L. Wankowski ◽  
Michael J. Kaul ◽  
Mark L. Dietz
Keyword(s):  
Ionic Liquids ◽  
Crown Ether ◽  
Metal Ion ◽  
Alkaline Earth ◽  
Micelle Formation ◽  
Ion Pair ◽  
Neutral Complex ◽  
Ion Partitioning ◽  
Alkaline Earth Cations ◽  
Complex Ion

In the extraction of alkali and alkaline earth cations by a crown ether into certain N-alkylpyridinium-based ILs, the balance between neutral complex/ion-pair partitioning and ion exchange is significantly altered by the formation of micelles in the aqueous phase involving the IL cation.

Cross-Sensitive Potentiometric Sensors Based on Anti-Crown (C6HgF4)3

2021 ◽  
Vol 5 (1) ◽  
pp. 72
Author(s):  
Ekaterina Yuskina ◽  
Kirill Tugashov ◽  
Vladimir B. Shur ◽  
Irina A. Tikhonova ◽  
Vasily Babain ◽  
...  
Keyword(s):  
Crown Ether ◽  
Aqueous Solutions ◽  
Alkaline Earth ◽  
Active Component ◽  
Polymeric Membranes ◽  
Potentiometric Sensors ◽  
Inorganic Salts

In this work, we explore the possibility of using anti-crown ether (C6HgF4)3 as a membrane-active component for potentiometric cross-sensitive sensors. Anti-crown ligands have already been employed as ionophores in plasticized polymeric membranes; however, the results of these studies are contradictory. In order to clarify the electrochemical sensitivity patterns of anti-crown-based sensors, we have studied plasticized polymeric membranes containing cation and anion-exchanging additives and various solvent-plasticizers. We explored the electrochemical sensitivity of these membranes in a wide variety of aqueous solutions of inorganic salts. Alkaline, alkaline-earth, and d-element salts with different anions were studied. It was found that the sensors based on anti-crown (C6HgF4)3 exhibit cationic sensitivity, and no considerable anionic responses were observed.

Interaction of Alkaline Earth Metal Ions with Carboxylic Acids in Aqueous Solutions studied by 13C NMR Spectroscopy

1998 ◽  
Vol 53 (1-2) ◽  
pp. 77-91 ◽  
Author(s):  
Akiko Kondoh ◽  
Takao Oi
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Carboxylic Acids ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Ion Concentration ◽  
Alkaline Earth Metal ◽  
Magnesium Ion ◽  
Alkaline Earth Metal Ions ◽  
C Nmr

Abstract13C NMR spectroscopic measurements of aqueous solutions containing alkaline earth metal chloride and a carboxylic acid have been carried out to acquire some insight into the coordination manners of various carboxylic acids to alkaline earth metal ions. The dependence of the 13C NMR signal positions of the carboxylate carbons on the magnesium ion concentration in a magnesium carboxylate system is a good index to understand the coordination manner of the carboxylate ion. The upfield shift of the carboxylate carbon signal with increasing magnesium ion concentration indicates that the carboxylate ion acts as a bidentate ligand to form a ring structure. Only in the citrate systems, the existence of a relatively stable complex is evidenced in which the citrate ion is expected to act as a tridentate ligand.

The stability of complexes of alkali and alkaline earth ions with crown ether carboxylic acids

Polyhedron ◽  
1991 ◽  
Vol 10 (13) ◽  
pp. 1591-1592 ◽  
Author(s):  
Heinz Bukowsky ◽  
Erhard Uhlemann ◽  
Karsten Gloe ◽  
Petern Mühl
Keyword(s):  
Crown Ether ◽  
Carboxylic Acids ◽  
Alkaline Earth ◽  
Stability Of Complexes ◽  
The Stability
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