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Praseodymium can form many different oxides, although the only oxides that are stable at room temperature are Pr 2 O 3, Pr 6 O 11 and PrO 2.Praseodymium(III) oxide is a green powder that forms hexagonal crystals, [14] and crystallizes in the manganese(III) oxide or bixbyite structure. [15]
The value for the Pr 3+ /Pr couple is −2.35 V. [25] However, in highly basic aqueous media, Pr 4+ ions can be generated by oxidation with ozone. [ 26 ] Although praseodymium(V) in the bulk state is unknown, the existence of praseodymium in its +5 oxidation state (with the stable electron configuration of the preceding noble gas xenon ) under ...
Praseodymium(III) oxide, praseodymium oxide or praseodymia is the chemical compound composed of praseodymium and oxygen with the formula Pr 2 O 3. It forms light green hexagonal crystals. [ 1 ] Praseodymium(III) oxide crystallizes in the manganese(III) oxide or bixbyite structure.
Pr 6 O 11 adopts a cubic fluorite crystal structure, measured by XRD, TEM and SEM methods. [3] [5] It can be considered an oxygen deficient form of praseodymium(IV) oxide (PrO 2), with the Pr ions being in a mixed valency state Pr(III) and Pr(IV). [5] This characteristic is what gives the oxide its many useful properties for its catalytic activity.
Praseodymium(III) carbonate forms compounds with N 2 H 4, such as Pr 2 (CO 3) 3 •12N 2 H 4 •5H 2 O which is a pale green crystal that is slightly soluble in water but insoluble in benzene, with d20°C = 1.873 g/cm 3. [6]
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Praseodymium(III) nitrate is any inorganic compound with the chemical formula Pr(NO 3) 3 ·xH 2 O. These salts are used in the extraction and purification of praseodymium from its ores. [2] The hexahydrate has been characterized by X-ray crystallography. [3] Praseodymium nitrate can be prepared by treating praseodymium oxide with nitric acid:
Pr(OH) 3 + 3CH 3 COOH forms Pr(CH 3 CO 2) 3 + 3H 2 O; Praseodymium(III) hydroxide + Acetic acid forms praseodymium(III) acetate and water. References This page ...