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Reference.org
Anation
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<p>In <a href="/facts/Coordination_chemistry/1tCyeQUm">coordination chemistry</a>, anation is the "replacement of the ligand water by an anion in a coordination entity." The term is however used more loosely to include displacement of any neutral <a href="/facts/Ligand/6etB3qeW">ligand</a> by an anion. The reaction is pervasive in coordination chemistry. The reverse reaction, displacement of an anionic ligand by water, is called <a href="/facts/Aquation/sIkkqB3V">aquation</a>. </p>