Coordination Sphere
| Formula / Notation | [MLₙ]^x (inner sphere) |
|---|---|
| Also Known As | Inner coordination sphere, first coordination sphere, inner sphere |
What is Coordination Sphere?
The coordination sphere of a complex consists of the central metal atom or ion together with all ligands directly bonded to it. It is usually enclosed in square brackets in the formula of a coordination compound, for example [Co(NH₃)₆] in [Co(NH₃)₆]Cl₃. Species outside the coordination sphere are counterions and are not directly bonded to the metal.
Formula & Notation
Other Names / Synonyms: Inner coordination sphere, first coordination sphere, inner sphere
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The coordination sphere of a complex consists of the central metal atom or ion together with all ligands directly bonded to it. It is usually enclosed in square brackets in the formula of a coordination compound, for example [Co(NH₃)₆] in [Co(NH₃)₆]Cl₃. Species outside the coordination sphere are counterions and are not directly bonded to the metal.
Distinguishing inner and outer sphere components is essential for determining the formula, charge, and conductivity of coordination compounds, for writing dissociation equations, and for understanding substitution reaction mechanisms (inner sphere vs. outer sphere electron transfer).
Ligands within the coordination sphere may be tightly bound and not freely released (low toxicity from that ligand). However, upon complex decomposition in biological systems, toxic ligands can be released. The stability constant of the complex governs this risk.
The formula or notation for Coordination Sphere is: [MLₙ]^x (inner sphere)