Über eine Reihe saurer Verbindungen HX^VP₂O₈ und H₂X^IVP₂O₈ mit Schichtstruktur, X^V  As und Sb; X^IV  Si, Ge, Sn, Pb, Ti und Zr

Abstract

Es wird die Verbindung HAsP2O8 hergestellt und aus ihren Eigenschaften geschlossen, daß es sich um eine Verbindung mit Schichtstruktur handelt, in der die Protonen zwischen AsP2O8‐Schichten liegen und durch Kationen ersetzbar sind. Im zweiten Teil wird gezeigt, daß die Verbindung HSbP2O8 mit HAsP2O8 isomorph ist und daß sich außerdem eine ganze Reihe von Verbindungen H2XIVP2O8 mit XIV = Si, Ge, Sn, Pb, Ti und Zr herstellen läßt, die analog gebaute Schichtstrukturen bilden und ebenfalls Ionenaustauschereigenschaften haben.

Structural Insight into Layered Silicon Hydrogen Phosphates Containing [SiO6] Octahedra Prepared by Different Reaction Routes

“…in narrower sense compounds in the element system Si/P/O/(H), can show in contrast to most naturally occurring silicates and related silicon-oxygen compounds a sixfold coordination of the silicon with oxygen. SiP 2 O 7 , [7][8][9] Si 5 P 6 O 25 , [10] and Si(HPO 4 ) 2 ·xH 2 O (x = 0,1), [11,12] the silicon is present in [SiO 6 ] units at ambient pressure. stishovite.…”

“…Silicophosphate compounds with sixfold coordinated silicon atoms obtained from pyrophosphoric acid H 4 P 2 O 7 and tetraalkoxysilanes via a sol-gel route exhibit the same shortrange order. SiP 2 O 7 , [7][8][9] Si 5 P 6 O 25 , [10] and Si(HPO 4 ) 2 ·xH 2 O (x = 0,1), [11,12] the silicon is present in [SiO 6 ] units at ambient pressure. in narrower sense compounds in the element system Si/P/O/(H), can show in contrast to most naturally occurring silicates and related silicon-oxygen compounds a sixfold coordination of the silicon with oxygen.…”

“…This synthesis is performed normally with crystalline phosphoric acid and tetraalkoxysilanes in ether. Although the silicophosphate Si(HPO 4 ) 2 has already been investigated in the past, [11,12,[36][37][38] to the best of our knowledge its structure has not been reported in detail so far in literature and is still under discussion. [33] We present here two new synthetic routes for silicon hydrogen phosphates, which are completely different from each other.…”

Vibrational spectra of α-Ge(HPO4)2·H2O compound

“…These materials have been proposed as host matrices for preparing solids nanocomposites through the intercalation of organic molecules and polymers [1][2][3][4]. In particular, several groups have been working in the synthesis of a-germanium hydrogenphosphate a-Ge(HPO 4 ) 2 ÁH 2 O (a-GeP) [5][6][7][8][9] and they have not really succeed to prepare a pure crystalline phase of a-GeP. La Ginestra et al [10] have prepared pure a-GeP by refluxing germanium tetrachloride in phosphoric acid and they have reported only thermal measurements and X-ray diffraction data.…”

Synthesis, characterization and lithium selective ion-exchange properties of crystalline tin(IV) arsenate

“…In order to make use of such exchangers in separation processes, their stability in aqueous medium and their selectivity are the two important parameters. Among such materials the phosphates and arsenates of group IV elements have shown interesting selective properties for a series of cations [5][6][7][8][9]. Extensive work on the applications of zirconium phosphates has generated sufficient interest in the preparation of other insoluble acid salts of many tetravalent metals [10][11][12][13].…”