6

Coordination Chemistry

Many metal ions form aggregate with Lewis bases which are stable in solution, such species are known as coordination compounds or complex compounds. A complex may be positive ion, a negative ion or even neutral. It depends upon the charge of the metal ion and the donor. Example,

 

[Co(NH3)6]+3,

O.N.of cobalt is +3 and NH3 is neutral.

[Fe(CH6]4−,

O.N. of iron is Fe2+ and cyanide ion (CN) is uninegative

[Cu(H2NCH2OO)2],

O.N. of copper is +2 and glycinate ion is uninegative.

 

Complex compound are made by chemical species which have independent existence, such as Co+3, Fe3+, Cu2+, NH3 CN etc. Thus, complexes are chemical compounds which contain a metal ion, surrounded by Lewis bases and the aggregate retain ...

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