Praseodymium(III) iodide

Praseodymium(III) iodide
Names
Other names
Praseodymium triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.046 Edit this at Wikidata
EC Number
  • 237-466-1
  • InChI=1S/3HI.Pr/h3*1H;/q;;;+3/p-3
    Key: PVEVRIVGNKNWML-UHFFFAOYSA-K
  • I[Pr](I)I
Properties
PrI3
Molar mass 521.619 g/mol
683.75652 g/mol (nonahydrate)
Appearance hygroscopic green crystals
Density 5.8 g/cm3[1]
Melting point 738 °C (1,360 °F; 1,011 K)[1]
Boiling point 1,380 °C (2,520 °F; 1,650 K)
213.9 g/100 mL[2]
Hazards
GHS labelling:[3]
GHS07: Exclamation markGHS08: Health hazard
Danger
H317, H360
P203, P261, P272, P280, P302+P352, P318, P321, P333+P313, P362+P364, P405, P501
Related compounds
Other anions
Praseodymium(III) fluoride
Praseodymium(III) chloride
Praseodymium(III) bromide
Other cations
Cerium(III) iodide
Neodymium(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Praseodymium(III) iodide is an inorganic salt, consisting of the rare-earth metal praseodymium and iodine, with the chemical formula PrI3. It forms green crystals.[4] It is soluble in water.[5]

Preparation

[edit]
  • Heating praseodymium and iodine in an inert atmosphere produces praseodymium(III) iodide:[1]
  • It can also be obtained by heating praseodymium with mercury(II) iodide:[6]

Properties

[edit]

Praseodymium(III) iodide forms green crystals, which are soluble in water.[5] It forms orthorhombic crystals which are hygroscopic.[1] It crystallizes in the PuBr3 type[6][7] with space group Cmcm (No. 63) with a = 4.3281(6) Å, b = 14.003(6) Å and c = 9.988(3) Å.[8] It decomposes through an intermediate phase 2 PrI3·PrOI to a mixture of praseodymium oxyiodide and praseodymium oxide (5 PrOI·Pr2O3).[9]

Reactions

[edit]
  • PrI3 forms compounds with hydrazine, like I3Pr·3N2H4·4H2O which has pale yellow crystals and soluble in methanol, slightly soluble in water, and insoluble in benzene, d20 °C = 2.986 g/cm3.[10]
  • PrI3 forms compounds with urea, like I3Pr·5CO(NH2)2 which has pale green crystals.[11]
  • PrI3 forms compounds with thiourea, like I3Pr·2CS(NH2)2·9H2O which is a green crystal with d = 2.27 g/cm3.[5][12]
Pr2O3 + 6 HI + 15H2O → 2 PrI3·9H2O
2 PrI3 + Pr → 3 PrI2

See also

[edit]

References

[edit]
  1. ^ a b c d Haynes, William M. (2016-06-22). CRC Handbook of Chemistry and Physics. CRC Press. pp. 2016–2652. ISBN 978-1-4987-5429-3.
  2. ^ Solubility_Table_Zh.PDF_version.pdf
  3. ^ "Praseodymium triiodide". pubchem.ncbi.nlm.nih.gov.
  4. ^ a b Timofte, T.; Babai, A.; Meyer, G.; Mudring, A.-V. (2005). "Praseodymium triiodide nonahydrate". Acta Crystallogr. E. 61 (6): i94–i95. Bibcode:2005AcCrE..61I..94T. doi:10.1107/S1600536805012857.
  5. ^ a b c "Solubility_Table_Zh" (PDF). 27 August 2016.
  6. ^ a b Asprey, L. B.; Keenan, T. K.; Kruse, F. H. (1964). "Preparation and Crystal Data for Lanthanide and Actinide Triiodides". Inorg. Chem. 3 (8): 1137–1141. doi:10.1021/ic50018a015.
  7. ^ Wells, A. F. (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. p. 421. ISBN 978-0-19-965763-6.
  8. ^ E. Warkentin, H. Bärnighausen (1979), "Die Kristallstruktur von Praseodymdiiodid (Modifikation V)", Zeitschrift für anorganische und allgemeine Chemie (in German), vol. 459, no. 1, pp. 187–200, doi:10.1002/zaac.19794590120
  9. ^ Heiniö, Outi; Leskelä, Markku; Niinistö, Lauri; Tuhtar, Dinko; Sjöblom, Johan; Strand, T. G.; Sukhoverkhov, V. F. (1980). "Structural and Thermal Properties of Rare Earth Triiodide Hydrates". Acta Chemica Scandinavica. 34a: 207–211. doi:10.3891/acta.chem.scand.34a-0207. ISSN 0904-213X.
  10. ^ Uchenye zapiski: Serii︠a︡ khimicheskikh nauk (S.M. Kirov adyna Azărbai̐jan Dȯvlăt Universiteti; 1977), trang 37. Truy cập 1 tháng 1 năm 2021.
  11. ^ Russian Journal of Inorganic Chemistry, Tập 18,Phần 2 (British Library Lending Division with the cooperation of the Royal Society of Chemistry, 1973), trang 1655. Truy cập 1 tháng 1 năm 2021.
  12. ^ Villars, Pierre; Cenzual, Karin; Gladyshevskii, Roman (24 July 2017). Handbook of Inorganic Substances 2017. Walter de Gruyter GmbH & Co KG. p. 5090. ISBN 978-3-11-043655-6.
  13. ^ Gerlitzki, Niels; Meyer, Gerd; Mudring, Anja-Verena; Corbett, John D. (2004). "Praseodymium diiodide, PrI2, revisited by synthesis, structure determination and theory". J. Alloys Compd. 380 (1–2). Elsevier BV: 211–218. doi:10.1016/j.jallcom.2004.03.046. ISSN 0925-8388.