Anhydrous Aluminum Carbonates and Isostructural Compounds
Lkhamsuren Bayarjargal,
Dominik Spahr,
Victor Milman
et al.
Abstract:We synthesized the inorganic anhydrous
aluminum carbonates
Al2[C2O5][CO3]2 and
Al2[CO3]3 by reacting Al2O3 with CO2 at high pressures and temperatures
and characterized them by Raman spectroscopy. Their structures were
solved by X-ray diffraction. Al2[CO3]3 forms at around 24–28 GPa, while Al2[C2O5][CO3]2 forms above 38(3) GPa.
The distinguishing feature of the new Al2[C2O5][CO3]2-structure type is the
presence of pyrocarbonate [C2O5]2–-groups, trigonal [CO3]2groups, and
octahedrally coordinated trivalent cat… Show more
“…It is characterized by the presence of twisted pyrocarbonate anions. This is in contrast to other pyrocarbonates, 1,2,18 to the proposed theoretical equilibrium geometry of the [C 2 O 5 ] 2− -species 10,11 and in disagreement with the recent prediction of a monoclinic Ba[C 2 O 5 ]. 19 The ability of the [C 2 O 5 ] 2− -group to rotate the constituting [CO 3 ] 2− -groups relative to each other while maintaining the shared oxygen atom provides structural flexibility.…”
contrasting
confidence: 93%
“…1c). 18 The maximal distances between oxygen atoms in the [C 2 O 5 ] 2− -groups (O⋯O) are similar in these pyrocarbonates (≈4.3 Å). While the current manuscript was under evaluation, a structure prediction for Ba[C 2 O 5 ] was published.…”
Ba[C2O5] was synthesized by reacting Ba[CO3] with CO2 and contains twisted [C2O5]2−-groups, an atomic arrangement previously not observed in carbonates.
“…It is characterized by the presence of twisted pyrocarbonate anions. This is in contrast to other pyrocarbonates, 1,2,18 to the proposed theoretical equilibrium geometry of the [C 2 O 5 ] 2− -species 10,11 and in disagreement with the recent prediction of a monoclinic Ba[C 2 O 5 ]. 19 The ability of the [C 2 O 5 ] 2− -group to rotate the constituting [CO 3 ] 2− -groups relative to each other while maintaining the shared oxygen atom provides structural flexibility.…”
contrasting
confidence: 93%
“…1c). 18 The maximal distances between oxygen atoms in the [C 2 O 5 ] 2− -groups (O⋯O) are similar in these pyrocarbonates (≈4.3 Å). While the current manuscript was under evaluation, a structure prediction for Ba[C 2 O 5 ] was published.…”
Ba[C2O5] was synthesized by reacting Ba[CO3] with CO2 and contains twisted [C2O5]2−-groups, an atomic arrangement previously not observed in carbonates.
“…3 Very recently, the synthesis of the mixed carbonate–pyrocarbonate Al 2 [C 2 O 5 ][CO 3 ] 2 showed that pyrocarbonates containing trivalent cations may also be obtained. 4…”
mentioning
confidence: 99%
“…It was found that the geometry of the pyrocarbonate group can vary significantly by a tilt of the two planar [CO 3 ] 2− -groups of the [C 2 O 5 ] 2− -complex anion around the common central bridging oxygen atom. 1–4…”
mentioning
confidence: 99%
“…Raman modes occurring at these wavenumbers are characteristic for vibrations of a [C 2 O 5 ] 2− -group. 1–4 Hence, we mapped the phase distribution across the gasket hole in order to locate the new pyrocarbonate for the subsequent single crystal X-ray diffraction experiments (Fig. 1c, e and f).…”
Na2[C2O5] was synthesized by reacting Na2[CO3] with CO2. It is an inorganic, acentric pyrocarbonate characterized by alternating layers of tilted [C2O5]2−-groups and alkali metal cations.
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