Complex (coordination complex)

complex (or coordination complex) in chemistry and biochemistry is the product of the formation, often reversible, of a bond between a central atom or ion (or coordinating ion) and the atoms, ions, or molecules (called ligands or coordinated ions) that surround the central atom (called the coordination center).

A more rigorous definition of a chemical complex can be:

A complex is a chemical compound in which an atom binds a number of other chemical species greater than its oxidation number.

There are many types of complexes, ranging from simple metal in aqueous solution (therefore coordinated by water molecules) to metal-enzyme complexes, which take part in various biochemical processes.

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