Manganese(III) fluoride 1709191 221110917 2008-06-23T02:36:10Z DOI bot 6652755 Citation maintenance. Initiated by [[User:Fconaway|Fconaway]]. You can [[WP:DOI|use this bot]] yourself! Please [[User:DOI_bot/bugs|report any bugs]]. {{Chembox new | Name = Manganese(III) fluoride | ImageFile = Manganese(III) fluoride.jpg | ImageSize = 200px | ImageName = Manganese(III) fluoride | IUPACName = Manganese(III) fluoride | OtherNames = Manganese trifluoride | Section1 = {{Chembox Identifiers | CASNo = 7783-53-1 | RTECS = OP0882600 }} | Section2 = {{Chembox Properties | Formula = F<sub>3</sub>Mn | MolarMass = 111.938 g/mol | Appearance = purple-pink powder | Density = 3.54 g/cm³, solid | Solubility = hydrolysis | MeltingPt = °C (? K) }} | Section3 = {{Chembox Structure | Coordination = distorted octahedral | CrystalStruct = [[Vanadium(III) fluoride|VF<sub>3</sub>]] }} | Section7 = {{Chembox Hazards | MainHazards = toxic fumes | RPhrases = 8-20/21/22-36/37/38 | SPhrases = 17-26-36/37/39 }} | Section8 = {{Chembox Related | OtherCpds = Manganese acetylacetonate<br />[[Cobalt(III) fluoride]] }} }} '''Manganese trifluoride''' is the [[chemical compound]] with the formula MnF<sub>3</sub>. This purplish solid is highly reactive, being unstable in moist air and liberating F<sub>2</sub> upon heating. MnF<sub>3</sub> is useful for converting [[hydrocarbon]]s into [[fluorocarbon]]s; i.e., it is a fluorination agent.<ref>Burley, G. A.; Taylor, R. "Manganese(III) fluoride" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10.1002/047084289.</ref> :R<sub>3</sub>C-H + 2 MnF<sub>3</sub> &rarr; R<sub>3</sub>C-F + HF + 2MnF<sub>2</sub> A related fluorinating [[reagent]] is [[Cobalt(III) fluoride|CoF<sub>3</sub>]]. ==Synthesis and reactions== MnF<sub>3</sub> can be prepared by treating a solution of MnF<sub>2</sub> in anhydrous [[hydrogen fluoride]] with [[fluorine]]:<ref>{{cite journal | title = Room temperature syntheses of MnF<sub>3</sub>, MnF<sub>4</sub> and hexafluoromanganete(IV) salts of alkali cations | author = Z. Mazej | journal = Journal of Fluorine Chemistry | year = 2002 | volume = 114 | issue = 1 | pages = 75–80 | doi = 10.1016/S0022-1139(01)00566-8 }}</ref> :MnF<sub>2</sub> + 0.5 F<sub>2</sub> &rarr; MnF<sub>3</sub> In the crystalline state, MnF<sub>3</sub> resembles [[vanadium(III) fluoride]]: both feature octahedal metal centers with the same average M-F bond distances. In the Mn compound, however, is distorted (and hence a [[monoclinic]] unit cell vs. a higher symmetry one) due to the [[Jahn-Teller effect]], with pairs of Mn-F distances of 1.79, 1.91, 2.09 A.<ref>Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.</ref><ref>Hepworth, M. A.; Jack, K. H.; [[Ronald Sydney Nyholm|Nyholm]], R. S. ”Interatomic Bonding in Manganese Trifluoride” Nature 1957, 179, 211 - 212. doi:10.1038/179211b0</ref><ref>{{cite journal | title = The crystal structure of manganese trifluoride, MnF<sub>3</sub> | author = M. A. Hepworth, K. H. Jack | journal = Acta Crystallographica | year = 1957 | volume = 10 | issue = | pages = 345–351 | doi = 10.1107/S0365110X57001024}} </ref> Jahn-Teller distortions are characteristic of the presence of four d-electrons in the valence shell. ==Related Mn(III) and Mn(IV) compounds== The fluorination of MnF<sub>2</sub> in HF, if conducted in the presence of UV-irradiation, gives MnF<sub>4</sub>. This tetrafluoride is a relatively rare Mn(IV) species, the most famous example being [[manganese dioxide]]. Other manganese(III) compounds include manganese(III) acetate (CAS #993-02-2) manganese [[acetylacetonate]] (CAS# 14284-89-0), Both are employed as oxidants in [[organic synthesis]]. MnF<sub>3</sub> is Lewis acidic and forms a variety of derivatives. Two examples are K<sub>2</sub>MnF<sub>3</sub>(SO<sub>4</sub>)<ref>Bhattacharjee, M. N; Chaudhuri, M. K. “Dipotassium Trifluorosulfatomanganate(III)” Inorganic Syntheses, 1990, volume 27, pages 312-313. ISBN 0-471-50976-0</ref> and K<sub>2</sub>MnF<sub>5</sub>. ==Safety considerations== Like other reactive inorganic fluorides, MnF<sub>3</sub> should be stored in a polyethylene bottle. ==References== <references/> ==External links== *[http://www.npi.gov.au/database/substance-info/profiles/44.html National Pollutant Inventory: Fluoride and compounds fact sheet] *[http://www.npi.gov.au/database/substance-info/profiles/52.html National Pollutant Inventory: Manganese and compounds Fact Sheet] [[Category:Fluorides]] [[Category:Manganese compounds]] [[Category:Metal halides]] {{inorganic-compound-stub}} [[ar:فلوريد منغنيز ثلاثي]] [[pl:Fluorek manganu(III)]]