Interaction of adenylic acid with alkaline earth metal ions in the crystalline solid and aqueous solution. Evidence for the sugar C′2-endo/anti, C′3-endo/anti and C′4-exo/anti conformational changes

1990 ◽  
Vol 1087 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Heidar-Ali Tajmir-Riahi
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Conformational Changes ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Crystalline Solid ◽  
Alkaline Earth Metal ◽  
Alkaline Earth Metal Ions ◽  
Adenylic Acid

Mononuclear and dinuclear mechanisms for catalysis of phosphodiester cleavage by alkaline earth metal ions in aqueous solution

2010 ◽  
Vol 104 (2) ◽  
pp. 207-210 ◽  
Author(s):  
Brittany A. Kirk ◽  
Corey L. Cusack ◽  
Eric Laager ◽  
Evan Rochlis ◽  
Terace Thomas ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Alkaline Earth Metal Ions ◽  
Phosphodiester Cleavage

Effect of Temperature on the Complexation of Triscarbonatouranyl(VI) with Calcium and Magnesium in NaCl Aqueous Solution

2021 ◽  
Author(s):  
Chengming Shang ◽  
Pascal Reiller
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Effect Of Temperature ◽  
Alkaline Earth Metal ◽  
Alkaline Earth Metal Ions ◽  
Calcium And Magnesium

The complex formation of triscarbonatouranyl(VI) UO2(CO3)34- with alkaline earth metal ions Mg2+ and Ca2+ in 0.10 mol kgw-1 NaCl were studied at variable temperatures: 5-30°C for Mg2+ and 10-50°C for...

Diazacoronand-Linked α- and β-Cyclodextrin Dimer Complexes of the Brilliant Yellow Tetraanion

2004 ◽  
Vol 57 (6) ◽  
pp. 571 ◽  
Author(s):  
Oska Wyness ◽  
Bruce L. May ◽  
Philip Clements ◽  
Stephen F. Lincoln ◽  
Christopher J. Easton
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Brilliant Yellow ◽  
Complexation Constants ◽  
Cyclodextrin Dimer ◽  
Alkaline Earth Metal Ions ◽  
The Stability

Complexation of the Brilliant Yellow tetraanion, 14–, by the new coronand-linked α- and β-cyclodextrin (αCD and βCD) dimers 4,13-bis(6 A-deoxy-α-cyclodextrin-6 A-ylamidomethyl)-4,13-diaza-1,7,10-trioxacyclodecapentane and 4,13-bis(6 A-deoxy-β-cyclodextrin-6 A-ylamidomethyl)-4,13-diaza-1,7,10-trioxacyclodecapentane, 2 and 3, respectively, has been studied in aqueous solution. The complexation constants for 2 · 14– and 3 · 14– are K1 = (3.20 ± 0.05) × 105 and (2.76 ± 0.09) × 104 dm3 mol–1, respectively, at 298.2 K, pH 10.0, and I 0.10 mol dm–3 (NEt4ClO4). The pK a values of 2 · H22+ are 6.57 ± 0.04 and 5.88 ± 0.05, and of 3 · H22+ are 6.70 ± 0.03 and 6.08 ± 0.02. Complexation of the alkaline earth metal ions by 2 is characterized by complexation constants (2.73 ± 0.51) × 102, (1.52 ± 0.36) × 105, (1.49 ± 0.03) × 105, and (4.28 ± 0.07) × 104 dm3 mol–1 for Mg2+, Ca2+, Sr2+, and Ba2+, respectively. These data are compared with those reported for analogous coronand-linked βCD dimer complexes to establish the hierarchy of the factors determining the stability of such complexes.

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