manganese(II) perchlorate
{{Chembox
| Reference =
| Name =
| IUPACName =
| PIN =
| SystematicName =
| OtherNames = {{Unbulleted list
| Manganous perchlorate
| Manganese diperchlorate
}}
| data page pagename =
| ImageFile =
| ImageSize =
| ImageAlt =
| ImageName =
| ImageCaption =
| ImageFile1 =
| ImageSize1 =
| ImageAlt1 =
| ImageName1 =
| ImageCaption1 =
| ImageFile2 =
| ImageSize2 =
| ImageAlt2 =
| ImageName2 =
| ImageCaption2 =
| ImageFileL1 =
| ImageSizeL1 =
| ImageAltL1 =
| ImageNameL1 =
| ImageFileR1 =
| ImageSizeR1 =
| ImageAltR1 =
| ImageNameR1 =
| Section1 = {{Chembox Identifiers
| 3DMet =
| Abbreviations =
| Beilstein =
| CASNo = 13770-16-6
| CASNo_Comment =
| CASNoOther =
| ChEBI =
| ChemSpiderID = 146029
| EINECS =
| EC_number = 237-390-9
| EC_number_Comment=
| Gmelin =
| InChI = 1S/2ClHO4.Mn/c2*2-1(3,4)5;/h2*(H,2,3,4,5);/q;;+2/p-2
| KEGG =
| MeSHName =
| PubChem = 166899
| RTECS =
| SMILES = [O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Mn+2]
| UNNumber =
}}
| Section2 = {{Chembox Properties
| AtmosphericOHRateConstant =
| Appearance = White solid (anhydrous)
Rose-colored solid (hexahydrate)
| BoilingPt =
| BoilingPtC =
| BoilingPt_ref =
| BoilingPt_notes=
| Density = 2.10 g/cm3
| Formula = Mn(ClO4)2
| HenryConstant =
| LogP =
| MolarMass = 253.84 g/mol
| MeltingPt =
| MeltingPtC = 150
| MeltingPt_notes= (decomposes, hexahydrate)
| pKa =
| pKb =
| Solubility = 292 g/100 mL (25 °C){{cite book |author1=Nevil Vincent Sidgwick |author1-link=Nevil Sidgwick |title=The Chemical Elements and Their Compounds |date=1963 |publisher=Clarendon Press |location=Oxford |page=1285 |url=https://archive.org/details/dli.ernet.474790/page/1285/mode/2up |access-date=1 June 2024}}
| SolubleOther =
| Solvent =
| VaporPressure =
}}
| Section3 = {{Chembox Structure
| Coordination =
| CrystalStruct =
| MolShape =
}}
| Section4 = {{Chembox Thermochemistry
| DeltaGf =
| DeltaHc =
| DeltaHf =
| Entropy =
| HeatCapacity =
}}
| Section5 = {{Chembox Explosive
| ShockSens =
| FrictionSens =
| DetonationV =
| REFactor =
}}
| Section7 = {{Chembox Hazards
| AutoignitionPt =
| ExploLimits =
| FlashPt =
| LD50 =
| LC50 =
| MainHazards =
| NFPA-H = 1
| NFPA-F = 0
| NFPA-I = 2
| NFPA-S = OX
| PEL =
| REL =
| ExternalSDS =
| GHSPictograms = {{GHS03}}
| GHSSignalWord = Danger
| HPhrases =
| PPhrases =
}}
| Section9 = {{Chembox Related
| OtherAnions =
| OtherCations = Iron(II) perchlorate
Cobalt(II) perchlorate
Nickel(II) perchlorate
| OtherFunction =
| OtherFunction_label =
| OtherCompounds =
}}
}}
Manganese(II) perchlorate is an inorganic chemical compound with the formula Mn(ClO4)2. It forms a white-colored anhydrous and a rose-colored hexahydrate, both of which are hygroscopic. As a perchlorate, it is a strong oxidizing agent.{{cite journal |author1=J.L. Pascal |author2=J. Potier |author3=C.S. Zhang |title=Réaction du trioxyde de chlore avec le chlorure et le nitrate de manganèse (II). Synthèse du diperchloratomanganèse(II) : Mn(ClO4)2 et du triperchloratomanganate (II) de nitryle : NO2Mn(ClO4)3 |journal=Comptes Rendus de l'Académie des Sciences, Série 2 |date=1984 |volume=298 |issue=14 |pages=579–582 |url=https://gallica.bnf.fr/ark:/12148/bpt6k5831698v/f587.item# |access-date=9 April 2024 |language=fr}}
Production and reactions
The hexahydrate can be produced by reacting manganese metal or manganese(II) carbonate with perchloric acid, followed by the evaporation of the solution. The hexahydrate does not dehydrate when heating but instead oxidizes to manganese dioxide at 150 °C.{{cite journal |author1=M.B. Patel |author2=Sushama Patel |author3=D.P. Khandelwal |author4=H.D. Bist |title=Vibrational studies and phase transitions in Co(ClO4)2·6H2O and Mn(ClO4)2·6H2O |journal=Chemical Physics Letters |date=1983 |volume=101 |issue=1 |pages=93–99 |doi=10.1016/0009-2614(83)80311-X |language=en}}
To produce the anhydrous form, manganese(II) nitrate is reacted with dichlorine hexoxide at 5 °C:
:Mn(NO3)2 + 4 Cl2O6 → NO2Mn(ClO4)3 + NO2ClO4 + 4 ClO2 + O2
The resulting nitryl salt is subsequently heated at 105 °C in a vacuum to produce the anhydrous perchlorate.
:NO2Mn(ClO4)3 → Mn(ClO4)2 + NO2ClO4
Structure
The anhydrous form is predicted to be isostructural with cobalt(II) perchlorate, based on the IR spectrum and the Raman spectrum of the compound.
The hexahydrate consists of discrete [Mn(H2O)6]2+ octahedrons and perchlorate anions with lattice constants a = 7.85 Å, b = 13.60 Å and c = 5.30 Å. The hexahydrate undergoes phase transitions at low temperatures.{{cite journal |author1=B.K. Chaudhuri |title=A new type of phase transition in M(ClO4)2(H2O)6 M = Fe, Co, Ni and Mn |journal=Solid State Communications |date=1975 |volume=16 |issue=5 |pages=767–772 |doi=10.1016/0038-1098(75)90071-X |language=en}}