Chromatographic properties of type X zeolites containing alkali-earth metal cations

1973 ◽  
Vol 6 (8-9) ◽  
pp. 366-370 ◽  
Author(s):  
G. V. Tsitsishvili ◽  
T. G. Andronikashvili ◽  
T. A. Chumburidze
Keyword(s):  
Earth Metal ◽  
Metal Cations ◽  
Alkali Earth Metal ◽  
Alkali Earth ◽  
X Zeolites

Interactions of Nucleobases with Alkali Earth Metal Cations—Electrospray Ionization Mass Spectrometric Study

2007 ◽  
Vol 13 (5) ◽  
pp. 339-346 ◽  
Author(s):  
Magdalena Frańska
Keyword(s):  
Electrospray Ionization ◽  
Gas Phase ◽  
Earth Metal ◽  
Metal Cations ◽  
Mass Spectrometric Study ◽  
Cone Voltage ◽  
Ionization Mass ◽  
Alkali Earth Metal ◽  
Alkali Earth ◽  
Cation Radius

Interactions of nucleobases with alkali earth metal cations have been studied by electrospray ionization mass spectrometry (ESI-MS). Nucleobases containing at least one oxygen atom form stable complexes with alkali earth metal cations. This phenomenon can be explained on the grounds of the well known theory of hard and soft acids and bases. Uracil and thymine make complexes only when in their deprotonoted forms. The cations of great radii (Sr2+, Ba2+) are more prone to form complexes of stoichiometry 1:1 with uracil and thymine than the cations of small radii (Mg2+, Ca2+). On the other hand, Mg2+ forms complexes of stoichiometry 2:1 and 3:2 with uracil and thymine. Gas-phase stabilities of the 1:1 complexes are higher for the cations of small radii, in contrast to the solution stabilities. For cytosine and 9-methylhypoxantine the 1:1 complexes of their deprotonated forms are observed at higher cone voltage as a result of HCl molecule loss from the complexes containing the counter ion (Cl−). In solution, more stable complexes are formed with metal cations of low radii. Gas-phase stability of the complexes formed by deprotonated 9-methylhypoxantine increases with increasing metal cation radius.

Stabilization of alkali earth metal cations in Na-4-mica

2014 ◽  
Vol 101 ◽  
pp. 272-276 ◽  
Author(s):  
Jun Hyung Kim ◽  
Hong-Jin Kim ◽  
Man Park
Keyword(s):  
Earth Metal ◽  
Metal Cations ◽  
Alkali Earth Metal ◽  
Alkali Earth

Chromatographic properties of type y zeolites containing alkali-earth metal cations

1975 ◽  
Vol 8 (5) ◽  
pp. 223-227 ◽  
Author(s):  
T. G. Andronikashvili ◽  
G. V. Tsitsishvili ◽  
L. Ya. Laperashvili
Keyword(s):  
Earth Metal ◽  
Metal Cations ◽  
Y Zeolites ◽  
Alkali Earth Metal ◽  
Alkali Earth

Tautomeric crown-containing chemosensors for alkali-earth metal cations

Tetrahedron ◽  
2008 ◽  
Vol 64 (14) ◽  
pp. 3160-3167 ◽  
Author(s):  
Alexander D. Dubonosov ◽  
Vladimir I. Minkin ◽  
Vladimir A. Bren ◽  
Evgenii N. Shepelenko ◽  
Alexey V. Tsukanov ◽  
...  
Keyword(s):  
Earth Metal ◽  
Metal Cations ◽  
Alkali Earth Metal ◽  
Alkali Earth
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