The Effect of Alkali Metal Cations on The Structure of Dissolved Silicate Oligomers

1987 ◽  
Vol 111 ◽  
Author(s):  
Alon V. McCormick ◽  
A. T. Bell ◽  
C. J. Radke
Keyword(s):  
Nmr Spectroscopy ◽  
Alkali Metal ◽  
Base Composition ◽  
Ion Pairs ◽  
Metal Cations ◽  
Ion Pairing ◽  
Alkali Metal Cations ◽  
Silicate Anion ◽  
Cation Size ◽  
Dissolved Silicate

AbstractBy means of 29Si spectroscopy, it is established that the distribution of silicate anions in alkaline silicate solutions is a moderate function of base composition. At a fixed SiO2. concentration and silicate ratio, the proportion of Si present in oligomeric and cage-like structures increases in progressing from Li to Cs hydroxide. Interactions between alkali metal cations and silicate anions are investigated using NMR spectroscopy of the cations; in this way the concentration of ion pairs is measured as a function of cation size. As a result the silicate redistribution is ascribed to cation-silicate anion pairing and to a higher selectivity for ion pairing by large silicate anions as cation size increases.

Reaction between alkali metal ferrocyanides and persulfates in aqueous solution

1967 ◽  
Vol 45 (20) ◽  
pp. 2411-2418 ◽  
Author(s):  
R. W. Chlebek ◽  
M. W. Lister
Keyword(s):  
Aqueous Solution ◽  
Alkali Metal ◽  
Rate Constants ◽  
Ion Pairs ◽  
Metal Cations ◽  
Activation Energies ◽  
Alkali Metal Cations ◽  
Potassium Salts ◽  
Apparent Activation Energies

The rates of the reaction of ferrocyanide and persulfate ions, in the presence of various concentrations of different alkali metal cations, have been measured at various temperatures and ionic strengths. The results are interpreted in terms of ion pairs and support the view that the actual reacting species are MFe(CN)6−3 and MS2O8−, where M is an alkali metal. This is similar to the situation found earlier for potassium salts of these ions. The rate constants obtained on this assumption increase gradually from lithium to cesium. Values are also obtained for the apparent activation energies of these reactions.

scholarly journals ESR Studies of the Ion-pairs of the Acenaphthylene Radical Anion and Alkali Metal Cations

1967 ◽  
Vol 40 (6) ◽  
pp. 1325-1332 ◽  
Author(s):  
Masamoto Iwaizumi ◽  
Masayasu Suzuki ◽  
Taro Isobe ◽  
Hiroshi Azumi
Keyword(s):  
Alkali Metal ◽  
Radical Anion ◽  
Ion Pairs ◽  
Metal Cations ◽  
Alkali Metal Cations

ChemInform Abstract: ESR and ENDOR Investigation of the Ion Pairs of 4,4′-Dicyanobenzophenone Ketyl with Alkali-Metal Cations.

ChemInform ◽  
1989 ◽  
Vol 20 (7) ◽  
Author(s):  
M. BARZAGHI ◽  
A. GAMBA ◽  
C. OLIVA ◽  
M. BRANCA ◽  
A. SABA
Keyword(s):  
Alkali Metal ◽  
Ion Pairs ◽  
Metal Cations ◽  
Alkali Metal Cations

The structure of the ion pairs of the carbanion of indene with alkali metal cations

1972 ◽  
Vol 12 (4) ◽  
pp. 596-598 ◽  
Author(s):  
J. van der Kooij ◽  
N.H. Velthorst ◽  
C. MacLean
Keyword(s):  
Alkali Metal ◽  
Ion Pairs ◽  
Metal Cations ◽  
Alkali Metal Cations

Ion-pairing in polyoxometalate chemistry: impact of fully hydrated alkali metal cations on properties of the keggin [PW12O40]3− anion

2020 ◽  
Vol 49 (32) ◽  
pp. 11170-11178
Author(s):  
Alexey L. Kaledin ◽  
Qiushi Yin ◽  
Craig L. Hill ◽  
Tianquan Lian ◽  
Djamaladdin G. Musaev
Keyword(s):  
Charge Transfer ◽  
Alkali Metal ◽  
Metal Cations ◽  
Ion Pairing ◽  
Ion Pair ◽  
Alkali Metal Cations ◽  
Contact Ion Pair ◽  
Intermolecular Charge Transfer ◽  
Hydrogen Bonded

The [PW12O40]3−[M+(H2O)16]3 is a “hydrogen bonded” ion-pair complex for M = Li, Na and K, but is a “contact” ion-pair complex for M = Rb and Cs, intermolecular charge transfer from the solvated counter cations M+(H2O)16 to the anion [PW12O40]3−.

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