New mixed aluminium–chromium diarsenate
نویسندگان
چکیده
Potassium chromium aluminium diarsenate, KCr1/4Al3/4As2O7, was prepared by solid-state reaction. The structure consists of (Cr1/4/Al3/4)O6 octa-hedra and As2O7 diarsenate groups sharing corners to build up a three-dimensional anionic framework. The potassium cations are located in wide channels running along the c-axis direction. The crystal structure is isostructural with the triclinic AIMIIIX2O7 (AI = alkali metal; MIII = Al, Cr, Fe; X = As, P) compounds. However, the MIII octa-hedrally coordinated site is 25% partially occupied by chromium and 75% by aluminium.
منابع مشابه
Crystal structure of CsCrAs2O7, a new member of the diarsenate family
Caesium chromium(III) diarsenate(V), CsCrAs2O7, was prepared by solid-state reactions. The title structure consists of isolated CrO6 octa-hedra and As2O7 diarsenate groups, sharing corners to build up a three-dimensional [CrAs2O7](-) anionic framework. In this framework, channels extending parallel to [001] are present in which the ten-coordinate Cs(+) ions reside. CsCrAs2O7 is isotypic with th...
متن کاملNew M +, M 3+-arsenates – the framework structures of AgM 3+(HAsO4)2 (M 3+ = Al, Ga) and M +GaAs2O7 (M + = Na, Ag)
The crystal structures of hydro-thermally synthesized silver(I) aluminium bis-[hydrogen arsenate(V)], AgAl(HAsO4)2, silver(I) gallium bis-[hydrogen arsenate(V)], AgGa(HAsO4)2, silver gallium diarsenate(V), AgGaAs2O7, and sodium gallium diarsenate(V), NaGaAs2O7, were determined from single-crystal X-ray diffraction data collected at room temperature. The first two compounds are representatives o...
متن کاملAn efficient and selective solvent-free oxidation of alcohols by shaking with chromium trioxide supported on aluminium silicate.
A selective oxidation of primary alcohols to the corresponding aldehydes by shaking with chromium trioxide supported on aluminium silicate at room temperature under solvent free conditions is reported. This new procedure can also oxidise secondary alcohols.
متن کاملDetermination of aluminium and chromium in slurried baby food samples by electrothermal atomic absorption spectrometry.
Electrothermal atomic absorption spectrometry was used to determine aluminium and chromium in different types of baby foods. Samples without previous treatment were introduced into the atomizer as suspensions, which were prepared in a medium containing 0.1% (w/v) Triton X-100 (for chromium) or 10% (v/v) ethanol (for aluminium), 5% (v/v) concentrated hydrogen peroxide, and 0.5% (v/v) concentrate...
متن کاملUse of Micellar Anionic Surfactant Solutions with Added Carbohydrates as Mobile Phases in Thin-layer Chromatography of Heavy Metal Cations. Separation of Mixtures of Aluminium(iii), Manganese(ii), and Chromium(vi)
A new thin-layer chromatographic system comprising silica gel ‘G’ as stationary phase and a micellar solution of sodium dodecyl sulphate (0.01 M) with added maltose (0.5 M) in 7:3 (v/v) ratio has been identified as most favourable for identification and separation of mixtures of aluminium(III), manganese(II), and chromium(VI). The presence of the carbohydrate enhances the separation efficiency ...
متن کامل