Role of Cation Size on the Structural Behavior of the Alkali-Metal Dodecahydro-closo-Dodecaborates

2009 ◽  
Vol 113 (26) ◽  
pp. 11187-11189 ◽  
Author(s):  
Jae-Hyuk Her ◽  
Wei Zhou ◽  
Vitalie Stavila ◽  
Craig M. Brown ◽  
Terrence J. Udovic
Keyword(s):  
Alkali Metal ◽  
Structural Behavior ◽  
Cation Size

Role of the Alkali-Metal Cation Size in the Self-Assembly of Polyoxometalate-Monolayer Shells on Gold Nanoparticles

2012 ◽  
Vol 51 (14) ◽  
pp. 7436-7438 ◽  
Author(s):  
Yifeng Wang ◽  
Offer Zeiri ◽  
Shelly Sharet ◽  
Ira A. Weinstock
Keyword(s):  
Gold Nanoparticles ◽  
Alkali Metal ◽  
Metal Cation ◽  
Self Assembly ◽  
Alkali Metal Cation ◽  
The Self ◽  
Cation Size

The Influence of Alkali Metal Hydroxides on Silica Condensation Rates: The Role of Ion Pairing

1988 ◽  
Vol 121 ◽  
Author(s):  
A. V. McCormick ◽  
A. T. Bell ◽  
C. J. Radke
Keyword(s):  
Alkali Metal ◽  
Ion Pairs ◽  
Ion Pairing ◽  
Alkaline Solutions ◽  
Nmr Spectrum ◽  
Metal Hydroxides ◽  
Selective Inversion ◽  
Metal Silicate ◽  
Cation Size

ABSTRACTThe condensation kinetics and the role of Ion pairing are investigated for silicate anions in alkaline solutions. Selective, and non-selective inversion recovery experiments are performed using the Si NMR spectrum of alkali metal silicate solutions. In this way the rates of condensation of silicate monomers is studied as a function of the nature of the base. These rates exhibit maxima with increasing cation size. The maxima are interpreted in terms of the concentration and activity of ion pair intermediates of the Si exchange reaction.Interactions between alkali metal cations and larger silicate anions in silicate solutions are investigated using NMR spectroscopy of the cations. The chemical shift and the resonance llnewidths are used to estimate the concentration of cation-silicate ion pairs. The concentration of pairs involving large anions increases with increasing cation size. Thus it is expected that condensation kinetics are influenced by the size of the silicate fragment.

scholarly journals Spotlight on Alkali Metals: The Structural Chemistry of Alkali Metal Thallides

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1013
Author(s):  
Stefanie Gärtner
Keyword(s):  
Crystal Structure ◽  
Alkali Metal ◽  
Crystal Structures ◽  
Alkali Metals ◽  
Valence Electron ◽  
Oxidation States ◽  
Valence Electron Concentration ◽  
Base Metals ◽  
Charge Balancing

Alkali metal thallides go back to the investigative works of Eduard Zintl about base metals in negative oxidation states. In 1932, he described the crystal structure of NaTl as the first representative for this class of compounds. Since then, a bunch of versatile crystal structures has been reported for thallium as electronegative element in intermetallic solid state compounds. For combinations of thallium with alkali metals as electropositive counterparts, a broad range of different unique structure types has been observed. Interestingly, various thallium substructures at the same or very similar valence electron concentration (VEC) are obtained. This in return emphasizes that the role of the alkali metals on structure formation goes far beyond ancillary filling atoms, which are present only due to charge balancing reasons. In this review, the alkali metals are in focus and the local surroundings of the latter are discussed in terms of their crystallographic sites in the corresponding crystal structures.

Thermally Induced Electron Transfer in a CsCoFe Prussian Blue Derivative: The Specific Role of the Alkali-Metal Ion

2004 ◽  
Vol 116 (28) ◽  
pp. 3814-3817 ◽  
Author(s):  
Anne Bleuzen ◽  
Virginie Escax ◽  
Alban Ferrier ◽  
Françoise Villain ◽  
Michel Verdaguer ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Alkali Metal ◽  
Prussian Blue ◽  
Metal Ion ◽  
Specific Role ◽  
Alkali Metal Ion ◽  
Thermally Induced
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