Difference between revisions of "Polonide"
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*ionic polonides, which appear to contain the Po<sup>2−</sup> anion; | *ionic polonides, which appear to contain the Po<sup>2−</sup> anion; | ||
*intermetallic polonides, in which the bonding is more complex. | *intermetallic polonides, in which the bonding is more complex. | ||
| − | As well as polonides which are intermediate between these two cases, there are also non-stoichiometric polonides and alloys of polonium. As would be expected from [[periodicity]], polonides are often structurally and chemically similar to [[telluride]]s. | + | As well as polonides which are intermediate between these two cases, there are also non-stoichiometric polonides and alloys of polonium. As would be expected from [[periodicity]], polonides are often structurally and chemically similar to [[telluride]]s. Polonides are usually prepared by a direct reaction between the elements.<ref name="AEC-chem">{{citation | last = Moyer | first = Harvey V. | contribution = Chemical Properties of Polonium | pages = 33–96 | title = Polonium | url = http://www.osti.gov/bridge/servlets/purl/4367751-nEJIbm/ | editor-last = Moyer | editor-first = Harvey V. | id = TID-5221 | doi = 10.2172/4367751 | year = 1956 | location = Oak Ridge, Tenn. | publisher = United States Atomic Energy Commission}}.</ref> |
| + | |||
| + | ==Ionic polonides== | ||
| + | The polonides of the most [[Electronegativity|electropositive]] metals show classic ionic structural types, and can be considered to contain the Po<sup>2−</sup> anion. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | ! Formula | ||
| + | ! Structure | ||
| + | ! Lattice<br/>parameter | ||
| + | ! Notes | ||
| + | |- | ||
| + | | Na<sub>2</sub>Po | ||
| + | | anti-fluorite | ||
| + | | 747.3(4) pm | ||
| + | | <ref name="G&E"/><ref name="AEC-chem"/> | ||
| + | |- | ||
| + | | CaPo | ||
| + | | halite | ||
| + | | 651.0(4) pm | ||
| + | | <ref name="G&E"/><ref name="AEC-chem"/> | ||
| + | |- | ||
| + | | BaPo | ||
| + | | halite | ||
| + | | | ||
| + | | <ref name="G&E"/> | ||
| + | |- | ||
| + | |} | ||
==References== | ==References== | ||
Revision as of 08:42, 25 May 2010
A polonide is a chemical compound of polonium with an element from groups 1–15 of the periodic table (including hydrogen, the lanthanoids and the actinoids).[1] Polonides are amongst the most stable sompounds of polonium,[2] and can be divided into two broad groups:
- ionic polonides, which appear to contain the Po2− anion;
- intermetallic polonides, in which the bonding is more complex.
As well as polonides which are intermediate between these two cases, there are also non-stoichiometric polonides and alloys of polonium. As would be expected from periodicity, polonides are often structurally and chemically similar to tellurides. Polonides are usually prepared by a direct reaction between the elements.[3]
Ionic polonides
The polonides of the most electropositive metals show classic ionic structural types, and can be considered to contain the Po2− anion.
| Formula | Structure | Lattice parameter |
Notes |
|---|---|---|---|
| Na2Po | anti-fluorite | 747.3(4) pm | [2][3] |
| CaPo | halite | 651.0(4) pm | [2][3] |
| BaPo | halite | [2] |
References
- ↑ Nomenclature of Inorganic Chemistry; IUPAC Recommendations 2005; Royal Society of Chemistry: Cambridge, 2005; pp 69,260. ISBN 0-85404-438-8, <http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf>.
- ↑ 2.0 2.1 2.2 2.3 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; p 899. ISBN 0-08-022057-6.
- ↑ 3.0 3.1 3.2 Moyer, Harvey V. Chemical Properties of Polonium. In Polonium; Moyer, Harvey V., Ed.; United States Atomic Energy Commission: Oak Ridge, Tenn., 1956; pp 33–96. TID-5221. doi:10.2172/4367751, <http://www.osti.gov/bridge/servlets/purl/4367751-nEJIbm/>.
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