| Revision as of 18:44, 11 January 2025 editSmokefoot (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers74,902 edits ←Created page with ''''Transition metal hydroxide complexes''' are a large family of coordination complexes containing hydroxide (OH<sup>-</sup>) as a ligand. The inventory is very large. ==Representative complexes== ===Homoleptic complexes=== Only a few homoleptic hydroxide complexes are known: {{chem2|2-, 2-, and 2-}}.<ref>{{cite journal |doi=10.1021/cm101490w |title=Hydroxometalates from Anion Exchange Reactions of [BF<su...' | Revision as of 18:52, 11 January 2025 edit undoSmokefoot (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers74,902 edits fmtNext edit → | ||
| Line 8: | Line 8: | ||
| ==Reactions== | ==Reactions== | ||
| Prominent reactions of metal hydroxides are their acid-base behavior. Protonation of metal hydroxides gives ]es: | Prominent reactions of metal hydroxides are their acid-base behavior. Protonation of metal hydroxides gives ]es: | ||
| :{{chem2| |
:{{chem2|L_{n}M\sOH + H+ <-> L_{n}M\sOH2+}} | ||
| In principle but not very commonly, metal hydroxides undergo deprotonation, yielding ]es: | In principle but not very commonly, metal hydroxides undergo deprotonation, yielding ]es: | ||
| :{{chem2| |
:{{chem2|L_{n}M\sOH <-> L_{n}M\dO- +H+}} | ||
| Characteristically, hydroxide ligands are compact and basic. They tend to function as ]s. One manifestation of this property is the preponderance of di-and polymetallic hydroxide complexes. A practical consequence of this feature is the tendency of metal aquo complexes to form precipitates of meta hydroxides. | Characteristically, hydroxide ligands are compact and basic. They tend to function as ]s. One manifestation of this property is the preponderance of di-and polymetallic hydroxide complexes. A practical consequence of this feature is the tendency of metal aquo complexes to form precipitates of meta hydroxides. | ||
| The hydroxo ligand is a nucleophile. This behavior is relevant to their role in enzymology. In ], a zinc hydroxide binds ]: | The hydroxo ligand is a nucleophile. This behavior is relevant to their role in enzymology. In ], a zinc hydroxide binds ]: | ||
| :{{chem2| |
:{{chem2|L_{n}M\sOH + CO2 <-> L_{n}MO\sO\sCO2H}} | ||
| ==References== | ==References== | ||
Revision as of 18:52, 11 January 2025
Transition metal hydroxide complexes are a large family of coordination complexes containing hydroxide (OH) as a ligand. The inventory is very large.
Representative complexes
Homoleptic complexes
Only a few homoleptic hydroxide complexes are known: [Pt(OH)6]−2, [Ti(OH)6]−2, and [Zr(OH)8(mOH)2]−2.
Reactions
Prominent reactions of metal hydroxides are their acid-base behavior. Protonation of metal hydroxides gives aquo complexes:
- LnM−OH + H ⇌ LnM−OH+2
In principle but not very commonly, metal hydroxides undergo deprotonation, yielding oxo complexes:
- LnM−OH ⇌ LnM=O +H
Characteristically, hydroxide ligands are compact and basic. They tend to function as bridging ligands. One manifestation of this property is the preponderance of di-and polymetallic hydroxide complexes. A practical consequence of this feature is the tendency of metal aquo complexes to form precipitates of meta hydroxides.
The hydroxo ligand is a nucleophile. This behavior is relevant to their role in enzymology. In carbonic anhydrase, a zinc hydroxide binds carbon dioxide:
- LnM−OH + CO2 ⇌ LnMO−O−CO2H
References
- Lin, Hechun; De Oliveira, Peter W.; Huch, Volker; Veith, Michael (2010). "Hydroxometalates from Anion Exchange Reactions of [BF4] based Ionic Liquids: Formation of [M(OH)6)] (M = Ti, Zr) and [Zr(OH)5]". Chemistry of Materials. 22 (24): 6518–6523. doi:10.1021/cm101490w.