- Source: Beryllium sulfate
Beryllium sulfate normally encountered as the tetrahydrate, [Be(H2O)4]SO4 is a white crystalline solid. It was first isolated in 1815 by Jons Jakob Berzelius. Beryllium sulfate may be prepared by treating an aqueous solution of many beryllium salts with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400 °C.
Structure
According to X-ray crystallography the tetrahydrate contains a tetrahedral Be(OH2)42+ unit and sulfate anions. The small size of the Be2+ cation determines the number of water molecules that can be coordinated. In contrast, the analogous magnesium salt, MgSO4·6H2O contains an octahedral Mg(OH2)62+ unit. The existence of the tetrahedral [Be(OH2)4]2+ ion in aqueous solutions of beryllium nitrate and beryllium chloride has been confirmed by vibrational spectroscopy, as indicated by the totally symmetric BeO4 mode attt 531 cm−1. This band is absent in beryllium sulfate, and the sulfate modes are perturbed. The data support the existence of Be(OH2)3OSO3.
The anhydrous compound has a structure similar to that of boron phosphate. The structure contains alternating tetrahedrally coordinated Be and S and each oxygen is 2 coordinate (Be-O-S). The Be-O distance is 156 pm and the S-O distance is 150 pm.
A mixture of beryllium and radium sulfate was used as the neutron source in the discovery of nuclear fission.
References
External links
International Chemical Safety Card 1351
IARC Monograph "Beryllium and Beryllium Compounds"
IPCS Health & Safety Guide 44
IPCS Environmental Health Criteria 106: Beryllium
IPCS CICAD 32
Kata Kunci Pencarian:
- Kamus rumus kimia
- Beryllium sulfate
- Beryllium
- Magnesium sulfate
- List of inorganic compounds
- Beryllium hydroxide
- Strontium sulfate
- Beryllium oxide
- Beryllium carbonate
- Beryllium chromate
- Berylliosis
