Synthesis and selectivity of sym-hydroxydibenzo-14crown-4 ionophores for protons, alkali metal cations, and alkaline earth cations in polymeric membranes

1990 ◽  
Vol 9 (2) ◽  
pp. 125-135 ◽  
Author(s):  
Uriel Olsher ◽  
Felix Frolow ◽  
Gil Shoham ◽  
Elzbieta Luboch ◽  
Zong-Yuan Yu ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Alkaline Earth ◽  
Metal Cations ◽  
Polymeric Membranes ◽  
Alkali Metal Cations ◽  
Alkaline Earth Cations

Structural study of nonlinear optical borates K1−xNaxSr4(BO3)3 (x≤0.5)

2010 ◽  
Vol 25 (S1) ◽  
pp. S11-S16 ◽  
Author(s):  
L. Wu ◽  
Y. Zhang ◽  
W. W. Su ◽  
Y. F. Kong ◽  
J. J. Xu
Keyword(s):  
Alkali Metal ◽  
Structural Study ◽  
Nonlinear Optical ◽  
Alkaline Earth ◽  
Metal Cations ◽  
Alkali Metal Cations ◽  
Ionic Radii ◽  
Metal Atoms ◽  
Na Substitution ◽  
Asymmetric Distortion

X-ray powder diffraction was used for the structural study of nonlinear optical borates K1−xNaxSr4(BO3)3 (x≤0.5). Results show that up to 50% K+ can be substituted by Na+ in orthorhombic K1−xNaxSr4(BO3)3. Isolated BO3 triangles in the Na-substituted compound constrict to adjust to a local distribution of alkali-metal atoms, which explains the large range of structural homogeneity. An expansion of the c axis in a unit cell with increasing Na substitution was found probably caused by the tilted BO3 triangles and asymmetric distortion of (K/Na)O8 polyhedra. As the ratio of ionic radii of alkaline-earth and alkali-metal cations decreases and the electronegative difference between alkaline-earth and alkali-metal cations increases, the crystal system of MM′4(BO3)3 borates changes from cubic to orthorhombic and then to monoclinic.

scholarly journals The phenoxyl group-modulated interplay of cation–π and σ-type interactions in the alkali metal series

2020 ◽  
Vol 22 (46) ◽  
pp. 27105-27120
Author(s):  
Giacomo Prampolini ◽  
Marco d'Ischia ◽  
Alessandro Ferretti
Keyword(s):  
Alkali Metal ◽  
Noncovalent Interactions ◽  
Metal Cations ◽  
Alkali Metal Cations ◽  
Striking Effect

An extensive exploration of the interaction PESs of phenol and catechol complexes with alkali metal cations reveals a striking effect of –OH substitution on the balance between cation-π and σ-type noncovalent interactions.

Influence of Alkali Metal Cations on the Photodimerization of Bromo Cinnamates Studied by Solid-State NMR

2020 ◽  
Vol 124 (50) ◽  
pp. 27614-27620
Author(s):  
Marufa Zahan ◽  
He Sun ◽  
Sophia E. Hayes ◽  
Harald Krautscheid ◽  
Jürgen Haase ◽  
...  
Keyword(s):  
Solid State ◽  
Alkali Metal ◽  
Solid State Nmr ◽  
Metal Cations ◽  
Alkali Metal Cations

Derivation of Class II Force Fields. 4. van der Waals Parameters of Alkali Metal Cations and Halide Anions

1997 ◽  
Vol 101 (39) ◽  
pp. 7243-7252 ◽  
Author(s):  
Zhengwei Peng ◽  
Carl S. Ewig ◽  
Ming-Jing Hwang ◽  
Marvin Waldman ◽  
Arnold T. Hagler
Keyword(s):  
Alkali Metal ◽  
Force Fields ◽  
Van Der Waals ◽  
Metal Cations ◽  
Class Ii ◽  
Alkali Metal Cations ◽  
Halide Anions

Fluorescence enhancement of dibenzo-18-crown-6 by alkali metal cations

1980 ◽  
Vol 84 (9) ◽  
pp. 994-999 ◽  
Author(s):  
Haruo Shizuka ◽  
Kiyoshi Takada ◽  
Toshifumi Morita
Keyword(s):  
Alkali Metal ◽  
Fluorescence Enhancement ◽  
Metal Cations ◽  
Alkali Metal Cations
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