Praseodymium(III) chloride: Difference between revisions

| verifiedrevid = 417316717

| Name = Praseodymium(III) chloride

| ImageFile = Praseodymium(III)-chloride-heptahydrate.jpg

| ImageFileL1 = UCl3.png

| ImageName =

| IUPACName = Praseodymium(III) chloride

| OtherNames = Praseodymium chloride; praseodymium trichloride

| Section1 = {{Chembox Identifiers

| CASNo = 10361-79-2

| CASNo_Ref = {{cascite}}

| RTECS =

| Section2 = {{Chembox Properties

| Formula = PrCl₃

| MolarMass = 247.24 g/mol (anhydrous)<br/>373.77 g/mol (heptahydrate)

| Appearance = blue-green solid (anhydrous)<br/>light green solid (heptahydrate)

| Density = 4.02 g/cm³ (anhydrous)<br/>2.250 g/cm³ (heptahydrate)

| Solubility = 104.0 g/100 ml (13°C)

| MeltingPt = 786 °C

| BoilingPt = 1710 °C

| pKa =

| pKb =

| Section3 = {{Chembox Structure

| Coordination = Tricapped trigonal prismatic<br />(nine-coordinate)

| CrystalStruct = [[Hexagonal crystal system|hexagonal]] ([[Uranium trichloride#Structure|UCl₃ type]]), [[Pearson symbol|hP8]]

| SpaceGroup = P6₃/m, No. 176

| Section7 = {{Chembox Hazards

| ExternalMSDS =

| EUIndex = Not listed

| MainHazards = Irritant

| FlashPt =

| RPhrases =

| SPhrases =

}}

| Section8 = {{Chembox Related

| OtherAnions = [[Praseodymium(III) fluoride]]<br/>[[Praseodymium bromide]]<br/>[[praseodymium iodide]]

| OtherCations = [[Cerium(III) chloride]]<br/>[[Neodymium(III) chloride]]

'''Praseodymium(III) chloride''' is the [[inorganic compound]] with the [[chemical formula|formula]] [[praseodymium|Pr]][[chloride|Cl]]₃. It is a blue-green solid that rapidly absorbs water on exposure to moist air to form a light green hepta[[water of hydration|hydrate]].

Praseodymium(III) chloride is prepared by treating praseodymium metal and [[hydrogen chloride]]:<ref name=ref7 /><ref name=ref6>L. F. Druding, J. D. Corbett, ''J. Am. Chem. Soc.'' '''83''', 2462 (1961); J. D. Corbett, ''Rev. Chim. Minerale'' '''10''', 239 (1973)^,</ref>

Hydrated salts of praseodymium(III) chloride can be prpared by treatment of either praseodymium metal or praseodymium(III) carbonate with [[hydrochloric acid]]:

Anhydrous PrCl₃ can be made by thermal dehydration of the hydrate at 400 °C in the presence of [[ammonium chloride]].<ref name=ref1 /><ref name=ref4>M. D. Taylor, P. C. Carter, ''J. Inorg. Nucl. Chem.'' '''24''', 387 (1962); J. Kutscher, A. Schneider, ''Inorg. Nucl. Chem. Lett.'' '''7''', 815 (1971).</ref> Alternatively the hydrate can be dehydrated using [[thionyl chloride]].<ref name=ref1/><ref name=ref5>J. H. Freeman, M. L. Smith, ''J. Inorg. Nucl. Chem.'' '''7''', 224 (1958).</ref>

Praseodymium(III) chloride is [[Lewis acid]]ic, classified as "hard" according to the [[HSAB concept]]. Rapid heating of the [[hydrate]] may cause small amounts of [[hydrolysis]].<ref name=ref1>F. T. Edelmann, P. Poremba, in: ''Synthetic Methods of Organometallic and Inorganic Chemistry'', (W. A. Herrmann, ed.), Vol. 6, Georg Thieme Verlag, Stuttgart, 1997.</ref> PrCl₃ forms a stable Lewis acid-base complex K₂PrCl₅ by reaction with [[potassium chloride]]; this compound shows interesting [[Luminescence|optical]] and [[Magnetism|magnetic]] properties.<ref name=ref7>J. Cybinska, J. Sokolnicki, J. Legendziewicz, G. Meyer ''Journal of Alloys and Compounds'' '''341''', 115-123 (2002).</ref>

When heated with alkali metal chlorides, it forms a series of ternary (compounds containing three different elements) materials with the formulae MPr₂Cl₇, M₃PrCl₆, M₂PrCl₅, and M₃Pr₂Cl₉ where M = K, Rb, Cs.<ref>Gerd Meyer "Ternary Chlorides and Bromides of the Rare-Earth Elements" Inorganic Syntheses, 1990, Volume 30, pp. 72–81. {{DOI|10.1002/9780470132616.ch15}}</ref>

#<!--old 8--> S. Sugiyama, T. Miyamoto, H. Hayashi, M. Tanaka, J. B. Moffat ''Journal of Molecular Catalysis A'', '''118''', 129-136 (1997).

| author = Druding L. F., Corbett J. D., Ramsey B. N.

| journal = [[Inorganic Chemistry (journal)|Inorganic Chemistry]]

[[Category:Praseodymium compounds]]

[[Category:Metal halides]]

[[fr:Chlorure de praséodyme]]