Coordination number
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In chemistry, coordination number (c.n.), as defined originally in 1893 by Alfred Werner, is the total number of neighbors of a central atom in a chemical compound.[1][2] In methane the coordination number for the carbon atom is 4. In inorganic chemistry the number of sigma bonds between ligand and the central atom count but not the number of pi bonds.
In materials science, the bulk coordination number is the number of atoms touching any other atom in a crystal lattice.
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Examples of high coordination number compounds are uranium and thorium bidentate nitrate-coordinated cluster compounds U(NO3)62- and Th(NO3)62-. When the surrounding ligands get smaller even higher coordination numbers are possible. One in silico study found a particularly stable PbHe152+ ion comprised of a central lead ion coordinated with no less than 15 helium atoms.[3].
References
- ↑ De, A.K: "A Text Book of Inorganic Chemistry", page 88. New Age International Publishers, 2003.
- ↑ IUPAC Compendium of Chemical Terminology 2nd Edition (1997)
- ↑ The Search for the Species with the Highest Coordination Number Andreas Hermann, Matthias Lein, and Peter Schwerdtfeger Angew. Chem. Int. Ed. 2007, 46, 2444 –2447 doi:10.1002/anie.200604148
External links
- Meteorite Book-Glossary C [1]
bg:Координационно число de:Koordinationszahlit:Numero di coordinazione he:מספר קואורדינציה uk:Координаційне число
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