Coordination Compound


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coordination compound

[kō‚ȯrd·ən′ā·shən ‚käm‚pau̇nd]
(chemistry)
A compound with a central atom or ion and a group of ions or molecules surrounding it. Also known as coordinated complex; Werner complex.

Coordination Compound

 

any of a group of compounds of complex composition. In these compounds, molecules of water, ammonium, acids, and salts are added to the complex ion. Examples of coordination compounds are crystal hydrates of the [Co(NH3)6]2(SO4)3·5H2O, type, various ammoniates, such as Cu[PtCl6]·18NH3, and various salts, such as (NH4)3[RuCl6]NH4NO3. Possessing an electrostatic field, the complex ion attracts dipolar molecules, forming in solution a second or even a third coordination sphere. The formation of coordination compounds can involve oxidation-reduction reactions, Van der Waals forces, and hydrogen bonds. Coordinated molecules or ions, for example, SCN in the compound [(NH3)2PtSCNSCNAg]NO3, can serve as secondary centers of addition.

REFERENCES

Grinberg, A. A. Vvedenie v khimiiu kompleksnykh soedinenii, 2nd ed. Moscow-Leningrad, 1951.
Khimiia koordinatsionnykh soedinenii. Edited by J. Bailar and D. Busch. Moscow, 1960. (Translated from English.)
Nekrasov, B. V. Osnovy obshchei khimii, vol. 3. Moscow, 1970.
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The second part systematically describes the synthesis, preparation and assembly of six important categories of compounds with wide coverage of distinct synthetic chemistry systems: coordination compounds, coordination polymers, clusters, organometallic compounds, non-stoichiometric compounds and inorganic polymers.
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Written in a highly readable, descriptive and accessible style Introduction to Coordination Chemistry describes properties of coordination compounds such as colour, magnetism and reactivity as well as the logic in their assembly and nomenclature.
In addition to general updating, highlights of the sixth edition include: a new section on metal complexes of chlorine, chlorophylls, phthalocyanines, and bacteriochloryphylls; vibrational spectra of novel coordination compounds prepared in inert gas matrices; and vibrational spectra of cytochrome c oxidase and blue copper proteins.

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