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Chemistry · Glossary

What is Coordination sphere?

Definition 18.4 University Chemistry — Year 2 · Chapter 18 — Transition Metals and Coordination Complexes

The coordination sphere of a complex is the set of the central atom and the ligands bound to it, written within square brackets; ions outside the brackets are counter-ions, not bound to the metal.

Chelating ligands. Left: ethane-1,2-diamine (en), bidentate through its two nitrogens. Middle: the ethanedioate ion (ox), bidentate through two oxygens. Right: the edta anion, which wraps round a metal ion with its two nitrogens and four carboxylate oxygens (hexadentate). Chelating ligands. Left: ethane-1,2-diamine (en), bidentate through its two nitrogens. Middle: the ethanedioate ion (ox), bidentate through two oxygens. Right: the edta anion, which wraps round a metal ion with its two nitrogens and four carboxylate oxygens (hexadentate). Chelating ligands. Left: ethane-1,2-diamine (en), bidentate through its two nitrogens. Middle: the ethanedioate ion (ox), bidentate through two oxygens. Right: the edta anion, which wraps round a metal ion with its two nitrogens and four carboxylate oxygens (hexadentate).
Chelating ligands. Left: ethane-1,2-diamine (en), bidentate through its two nitrogens. Middle: the ethanedioate ion (ox), bidentate through two oxygens. Right: the edta anion, which wraps round a metal ion with its two nitrogens and four carboxylate oxygens (hexadentate).
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