Dysprosium(III) carbonate
Chemical compound
From Wikipedia, the free encyclopedia
Dysprosium(III) carbonate is an inorganic compound with the chemical formula Dy2(CO3)3. It is a white, paramagnetic solid.[3]
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.023.428 |
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| Properties | |
| Dy2(CO3)3 | |
| Molar mass | 505.024 g·mol−1 |
| Appearance | white solid[1] |
| insoluble[1] | |
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| H315, H319, H335 | |
| P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Properties
An amorphous tetrahydrate exists, stable in air up to near the decomposition temperature.[3] It progressively loses water upon heating and is directly converted to dysprosium oxide (Dy2O3) by dehydration and carbonate calcination:[3][4]
- Dy2(CO3)3·xH2O → Dy2O3 + xH2O + 3 CO2
An orthorhombic kozoite-type DyCO3OH forms under hydrothermal conditions, and a poorly crystalline tengerite-type Dy2(CO3)·2-3H2O remains stable at ambient temperature.[3]
Preparation
Dysprosium(III) carbonate can be prepared by reacting a soluble dysprosium salt such as dysprosium(III) chloride with sodium carbonate, forming a white gel-like precipitate.[3][5] The flow rate of the Dy(III) solution and the reactor temperature affect the particle size of the product.[5]
Another method involves the hydrolysis of dysprosium trichloroacetate in a homogeneous phase reaction:[6]
- 2 Dy(Cl3CCOO)3 + (x+3)H2O → Dy2(CO3)3·xH2O + 3 CO2 + 6 CHCl3
Carbon dioxide and chloroform are formed as byproducts in this reaction.
It can also be prepared by passing carbon dioxide through a suspension of dysprosium hydroxide or oxide in water.[6] The conversion is slow and may not produce a pure product.[6] The reaction is fast with higher yields if supercritical CO2 at high pressure is used instead.[6]
Uses
It can be used as a photocatalyst for the degradation of methyl orange under ultraviolet light.[5]
Related compounds
The crystal structures of the hydroxide carbonate (DyOHCO3) and another basic carbonate (Dy2O2CO3) have been determined.[7][8] They can be prepared by hydrothermal synthesis involving the reaction of dysprosium(III) chloride and carbon dioxide with caesium carbonate and potassium carbonate respectively.[8]
The dysprosium tetracarbonate complex [C(NH2)3]4[Dy(CO3)4(H2O)](H3O)·13H2O has been characterized by single-crystal X-ray diffraction.[9] It can be prepared by treating saturated guanidinium carbonate solution with dysprosium nitrate.[9]