ChemInform Abstract: Complexation of Alkaline Earth Metal Cations in Propylene Carbonate by Macrocyclic Crown Ethers Featuring from Four to Ten Coordinating Sites.

1982 ◽  
Vol 13 (38) ◽  
Author(s):  
J. MASSAUX ◽  
G. ROLAND ◽  
J. F. DESREUX
Keyword(s):  
Propylene Carbonate ◽  
Crown Ethers ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Metal Cations ◽  
Alkaline Earth Metal

Extraction of Alkaline and Alkaline-Earth Metal Cations at Synergistic Action of Bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) and Substituted Calix[n]arenes in Nitrobenzene

1998 ◽  
Vol 63 (12) ◽  
pp. 2009-2014 ◽  
Author(s):  
Petr Vaňura ◽  
Ivan Stibor
Keyword(s):  
Synergistic Effect ◽  
Crown Ethers ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Metal Cations ◽  
Antagonistic Effect ◽  
Synergistic Action ◽  
Alkaline Earth Metal ◽  
Methyl Groups ◽  
Better Than

The extraction of alkaline and alkaline-earth metal cations at synergistic action of bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) and substituted calix[n]arenes (n = 4 and 6) in nitrobenzene was investigated. It was found that the lower-rim-substituted calix[4]arene with four (diethylcarbamoyl)methyl groups extracts calcium, strontium and barium in the systems under study much better than calixarenes which do not contain amide groups. Synergistic factor values log S(Ca) = 7, log S(Sr) = 5.5 and log S(Ba) = 5.4 were found. The competition of K+ and Na+ in the extraction of strontium is much lower than in analogous systems containing crown ethers. The addition of calixarene causes a synergistic effect in the extraction of sodium and an antagonistic effect in the extraction of cesium.

scholarly journals Dansyl - Substituted Aza Crown Ethers: Complexation with Alkali, Alkaline Earth Metal Ions and Ammonium

2011 ◽  
Vol 3 (1) ◽  
Author(s):  
Nelly Mateeva ◽  
Shihab Deiab ◽  
Edikan Archibong ◽  
Donka Tasheva ◽  
Bereket Mochona ◽  
...  
Keyword(s):  
Metal Ions ◽  
Crown Ethers ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Alkaline Earth Metal Ions ◽  
Aza Crown Ethers
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