Praseodymium(III) iodide

Praseodymium(III) iodide
Names
	Other names Praseodymium triiodide
Identifiers
CAS Number	13813-23-5;
3D model (JSmol)	Interactive image;
ChemSpider	75566;
ECHA InfoCard	100.034.046
EC Number	237-466-1;
PubChem CID	83744;
CompTox Dashboard (EPA)	DTXSID5065641 ;
	InChI InChI=1S/3HI.Pr/h3*1H;/q;;;+3/p-3 Key: PVEVRIVGNKNWML-UHFFFAOYSA-K;
	SMILES I[Pr](I)I;
Properties
Chemical formula	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)
Solubility in water	213.9 g/100 mL[2]
Hazards
	GHS labelling:[3]
Pictograms
Signal word	Danger
Hazard statements	H317, H360
Precautionary statements	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). Infobox references

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

Heating praseodymium and iodine in an inert atmosphere produces praseodymium(III) iodide:[1]

{\mathsf {2Pr+3I_{2}\ \xrightarrow {T} \ 2PrI_{3}}}

It can also be obtained by heating praseodymium with mercury(II) iodide:[6]

{\mathsf {2Pr+3HgI_{2}\ \xrightarrow {T} \ 2PrI_{3}+3Hg}}

Properties

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

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, d_{20 °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]

Praseodymium(III) iodide forms a nonahydrate, PrI₃·9H₂O. It can be obtained by dissolving praseodymium(III) oxide in concentrated aqueous hydroiodic acid:

Pr₂O₃ + 6 HI + 15H₂O → 2 PrI₃·9H₂O

It adopts the same structure as other light rare earth iodides (La–Ho) and contains a triangular tricapped prismatic nonaaqua ion [Pr(OH₂)₉]³⁺ and iodide counterions.[4]

Praseodymium(III) iodide reacts with praseodymium metal at elevated temperatures to form praseodymium diiodide:[13]

2 PrI₃ + Pr → 3 PrI₂

References

Haynes, William M. (2016-06-22). CRC Handbook of Chemistry and Physics. CRC Press. pp. 2016–2652. ISBN 978-1-4987-5429-3.
Solubility_Table_Zh.PDF_version.pdf
"Praseodymium triiodide". pubchem.ncbi.nlm.nih.gov.
Timofte, T.; Babai, A.; Meyer, G.; Mudring, A.-V. (2005). "Praseodymium triiodide nonahydrate". Acta Crystallogr. E. 61 (6): i94–i95. doi:10.1107/S1600536805012857.
"Solubility_Table_Zh" (PDF). 27 August 2016.
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.
Wells, A. F. (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. p. 421. ISBN 978-0-19-965763-6.
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
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.
Uchenye zapiski: Serii︠a︡ khimicheskikh nauk (S.M. Kirov adyna Azărbai̐jan Dȯvlăt Universiteti; 1977), trang 37. Truy cập 1 tháng 1 năm 2021.
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.
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.
Gerlitzki, Niels; Meyer, Gerd; Mudring, Anja-Verena; Corbett, John D. (2004). "Praseodymium diiodide, PrI₂, revisited by synthesis, structure determination and theory". J. Alloys Compd. Elsevier BV. 380 (1–2): 211–218. doi:10.1016/j.jallcom.2004.03.046. ISSN 0925-8388.

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[crc-1] 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.

[Timofte-4] Timofte, T.; Babai, A.; Meyer, G.; Mudring, A.-V. (2005). "Praseodymium triiodide nonahydrate". Acta Crystallogr. E. 61 (6): i94–i95. doi:10.1107/S1600536805012857.

[:0-5] "Solubility_Table_Zh" (PDF). 27 August 2016.

[AspreyKeenanKruse-6] 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.

[Gerlitzki-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. Elsevier BV. 380 (1–2): 211–218. doi:10.1016/j.jallcom.2004.03.046. ISSN 0925-8388.

Praseodymium(III) iodide

Preparation

Properties

Reactions

See also

References