Role of Cation Size in the Energy of Electron Transfer to 1:1 Polyoxometalate Ion Pairs {(M+)(Xn+VW11O40)}(8-n)-(M = Li, Na, K)

2000 ◽  
Vol 122 (14) ◽  
pp. 3544-3545 ◽  
Author(s):  
Vladimir A. Grigoriev ◽  
Craig L. Hill ◽  
Ira A. Weinstock
Keyword(s):  
Electron Transfer ◽  
Ion Pairs ◽  
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 Conversion of Methanol on Rutile TiO2 (110) and Tungsten Oxide Clusters: 2. The Role of Defects and Electron Transfer in Bifunctional Oxidic Photocatalysts

2021 ◽  
Author(s):  
Lars Mohrhusen ◽  
Jessica Kräuter ◽  
Katharina Al-Shamery
Keyword(s):  
Electron Transfer ◽  
Transition Metal ◽  
Metal Oxide ◽  
Tungsten Oxide ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Organic P ◽  
Rutile Tio2 ◽  
Metal Oxide Surfaces

The photochemical conversion of organic compounds on tailored transition metal oxide surfaces by (UV) irradiation has found wide applications ranging from the production of chemicals to the degradation of organic...

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