ChemInform Abstract: The Unprecedented Tetrakis-(disulfato)-silicate Anion [Si(S2O7)4]4-, Its Germanium Congener [Ge(S2O7)4]4-, and the Tris-(disulfato)-metallates [M(S2O7)3]2-(M: Si, Ge, Ti), Stabilized by Divalent Counter Cations B2+(B: Sr, Ba, Pb).

ChemInform ◽  
2013 ◽  
Vol 44 (14) ◽  
pp. no-no
Author(s):  
Christian Logemann ◽  
Katja Riess ◽  
Mathias S. Wickleder
Keyword(s):  
Silicate Anion

ChemInform Abstract: A Further Silicate Anion: (Si(NCSe)6)2-.

ChemInform ◽  
1988 ◽  
Vol 19 (45) ◽  
Author(s):  
W. HEININGER ◽  
K. POLBORN ◽  
G. NAGORSEN
Keyword(s):  
Silicate Anion

scholarly journals Structural changes in calcium silicate hydrate gel and resulting improvement in phosphate species removal properties after mechanochemical treatment

2018 ◽  
Vol 5 (12) ◽  
pp. 181403 ◽  
Author(s):  
Hirotaka Maeda ◽  
Satoshi Yokota ◽  
Toshihiro Kasuga
Keyword(s):  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Structural Changes ◽  
Mechanochemical Treatment ◽  
Gel Structure ◽  
Silicate Anion ◽  
Aqueous Environments ◽  
Phosphate Recovery ◽  
Phosphate Species ◽  
Species Removal

The discharge of phosphate species into aqueous environments is a key issue for eutrophication prevention. In this study, we investigate a mechanochemical treatment of calcium silicate hydrate (C-S-H) gel with different organic solvents with the aim of changing its structure and improving its phosphate species removal properties. The treatment leads to a collapse of the gel structure, resulting in the formation of defective structures in the silicate anion chains. The C-S-H gel sample milled with acetone exhibits better phosphate species recovery characteristics than does the unmilled C-S-H gel sample or the C-S-H gel sample milled with 1-propanol. Ultraviolet irradiation during phosphate recovery using the C-S-H gel sample milled with acetone further enhances the recovery properties.

Ein weiteres Silicat-Anion: [Si(NCSe)6]2– / A Further Silicate Anion: [Si(NCSe)6]2–

1988 ◽  
Vol 43 (7) ◽  
pp. 857-861 ◽  
Author(s):  
Wolfgang Heininger ◽  
Kurt Polborn ◽  
Günter Nagorsen
Keyword(s):  
Ir Spectra ◽  
Complex Anion ◽  
Molar Conductance ◽  
Acetonitrile Solution ◽  
Tetragonal Modification ◽  
Silicate Anion ◽  
X Ray ◽  
Low Concentrations ◽  
Orthorhombic Modification ◽  
Partial Dissociation

Abstract Reaction of SiCl4 with NMe4NCSe or NEt4NCSe in cold acetonitrile leads to the corresponding crystalline salts of the new hexa-coordinate silicon complex anion [Si(NCSe)6]2- (1 ] ; . Their crystallographic data were determined: [NMe4]2[Si(NCSe)6]: rhombohedral. R3̄. a = 897 pm. a = 84.1°. Z = 1. [NEt4]2[Si(NCSe)6], tetragonal modification (from pure acetonitrile): P42/m, a = 1056 pm. c - 1580 pm. Z = 2. [NEt4]2[Si(NCSe)6]. orthorhombic modification (from acetonitrile containing NEt4Cl): a = 1704 pm. b = 1986 pm. c = 1028 pm. Z = 4. N-bonding of the NCSe groups in [Si(NCSe)6]2 is proved by the X-ray structure analysis of [NMe4]2[Si(NCSe)6] and by IR spectra. The concentration dependence of the molar conductance of an acetonitrile solution of [NMe4]2[Si(NCSe)6] was studied. At low concentrations partial dissociation of the hexa-isoselenocyanatosilicate ion is observed.

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.

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