PREPARATION, CHARACTERISATION, AND SPECTROSCOPIC STUDIES OF HOMO- AND HETEROBIMETALLIC PINACOLATE DERIVATIVES OF ALKALINE EARTH METALS

2002 ◽  
Vol 32 (7) ◽  
pp. 1223-1233 ◽  
Author(s):  
Malti Sharma ◽  
Anirudh Singh ◽  
Ram Mehrotra
Keyword(s):  
Alkaline Earth ◽  
Spectroscopic Studies ◽  
Alkaline Earth Metals ◽  
Derivatives Of

Polyfunctional Derivatives of Imidodiphosphoric Acid as Extractants

1997 ◽  
Vol 62 (4) ◽  
pp. 620-625 ◽  
Author(s):  
Oldřich Navrátil ◽  
Petr Sládek ◽  
Alena Tokárová ◽  
Eckhard Herrmann ◽  
Moein Nouaman
Keyword(s):  
Aqueous Phase ◽  
Distribution Ratio ◽  
Alkaline Earth ◽  
Functional Group ◽  
Extraction Efficiency ◽  
Ester Group ◽  
Alkaline Earth Metals ◽  
Strontium Barium ◽  
Extraction Constants ◽  
Derivatives Of

The distribution of calcium, strontium, barium and scandium between aqueous and organic phases was studied using 0.1 M HNO3 or 0.01 to 0.1 M HCl as the aqueous phase and solutions of selected derivatives of organophosphoric reagents containing the conventional =P(O)NHP(O)= bifunctional group or the analogous trifunctional or tetrafunctional group in various organic solvents as the organic phase. The effect of substitution of one ester group by an OH or NH2 group was examined. While for the alkaline earth metals the distribution ratio increases if the bifunctional group is replaced by a higher-functional group, the reverse is true for scandium. The extraction efficiency is improved by the presence of OH or NH2 substituent groups. The composition of the extracted species was inferred by logarithmic analysis and the corresponding extraction constants were calculated.

Novel triphenyltin substituted derivatives of heavier alkaline earth metals

2000 ◽  
Vol 613 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Ulrich Englich ◽  
Karin Ruhlandt-Senge* ◽  
Frank Uhlig*
Keyword(s):  
Alkaline Earth ◽  
Alkaline Earth Metals ◽  
Derivatives Of
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