Editing Manganese (section)

===Organomanganese compounds===
{{main|Organomanganese chemistry}}
Manganese forms a large variety of organometallic derivatives, i.e., compounds with Mn-C bonds. The organometallic derivatives include numerous examples of Mn in its lower oxidation states, i.e. Mn(−III) up through Mn(I). This area of organometallic chemistry is attractive because Mn is inexpensive and of relatively low toxicity.<ref>{{cite journal |doi=10.1021/acs.inorgchem.9b00941 |title=Resurgence of Organomanganese(I) Chemistry. Bidentate Manganese(I) Phosphine–Phenol(ate) Complexes |date=2019 |last1=Kadassery |first1=Karthika J. |last2=MacMillan |first2=Samantha N. |last3=Lacy |first3=David C. |journal=Inorganic Chemistry |volume=58 |issue=16 |pages=10527–10535 |pmid=31247867 }}</ref>

Of greatest commercial interest is [[methylcyclopentadienyl manganese tricarbonyl]] (MMT), which is used as an [[anti-knock]] compound added to [[gasoline]] in some countries, featuring Mn(I).<ref name="ullmann" /> Consistent with other aspects of Mn(II) chemistry, [[manganocene]] ({{chem2|Mn(C5H5)2}}) is high-spin. In contrast, its neighboring metal, iron, forms an air-stable, low-spin derivative in the form of [[ferrocene]] ({{chem2|Fe(C5H5)2}}).  When conducted under an atmosphere of [[carbon monoxide]], reduction of Mn(II) salts gives [[dimanganese decacarbonyl]] {{chem2|Mn2(CO)10}}, an orange and volatile solid.  The air-stability of this Mn(0) compound (and its many derivatives) reflects the powerful electron-acceptor properties of carbon monoxide. Many [[alkene complex]]es and [[alkyne complex]]es are derived from {{chem2|Mn2(CO)10}}.{{sfn|Greenwood|Earnshaw|1997|pages=1062-1069}}

In Mn(CH<sub>3</sub>)<sub>2</sub>(dmpe)<sub>2</sub>, Mn(II) is low spin, which contrasts with the high spin character of its precursor, MnBr<sub>2</sub>(dmpe)<sub>2</sub> ([[dmpe]] =  (CH<sub>3</sub>)<sub>2</sub>PCH<sub>2</sub>CH<sub>2</sub>P(CH<sub>3</sub>)<sub>2</sub>).<ref>{{cite journal |doi=10.1021/ja00360a054|title=Hydrido, alkyl, and ethylene 1,2-bis(dimethylphosphino)ethane complexes of manganese and the crystal structures of MnBr2(dmpe)2, &#91;Mn(AlH4)(dmpe)2&#93;2 and MnMe2(dmpe)2 |year=1983 |last1=Girolami |first1=Gregory S. |last2=Wilkinson |first2=Geoffrey |last3=Thornton-Pett |first3=Mark |last4=Hursthouse |first4=Michael B. |journal=Journal of the American Chemical Society |volume=105 |issue=22 |pages=6752–6753 |bibcode=1983JAChS.105.6752G }}</ref> Poly[[Alkyl group|alkyl]] and poly[[Aryl group|aryl]] derivatives of manganese often exist in higher oxidation states, reflecting the electron-releasing properties of alkyl and aryl ligands.  One example is [Mn(CH<sub>3</sub>)<sub>6</sub>]<sup>2−</sup>.<ref>{{cite journal |author1=Robert J. Morris |author2=Gregory S. Girolami |title=Permethylmanganates. Synthesis and characterization of divalent [MnMe<sub>4</sub><sup>2-</sup>], trivalent [MnMe<sub>5</sub><sup>2-</sup>], and tetravalent [MnMe<sub>6</sub><sup>2-</sup>] |journal=Journal of the American Chemical Society |date=1988 |volume=110 |issue=18 |pages=6245–6246 |doi=10.1021/ja00226a049 |publisher=ACS Publications |pmid=22148809 |bibcode=1988JAChS.110.6245M |language=en}}</ref>