Ion-molecular equilibria in lanthanide triiodide vapors and formation enthalpies of LnI4− and Ln2I7− ions (Ln = La, Ce, Pr, Gd, Tb, Tm, and Lu)

Motalov, V.B.; Dunaev, A.M.; Kudin, L.S.; Butman, M.F.; Krämer, Karl (2019). Ion-molecular equilibria in lanthanide triiodide vapors and formation enthalpies of LnI4− and Ln2I7− ions (Ln = La, Ce, Pr, Gd, Tb, Tm, and Lu). International journal of mass spectrometry, 435, pp. 188-194. Elsevier 10.1016/j.ijms.2018.11.012

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Ion-molecular equilibria LaI4– + LnI3 = LnI4– + LaI3, Ln2I7– = LnI3,cr + LnI4– (Ln = Ce, Pr, Gd, Tb, Tm, and Lu), and 3LaBr4– + 4LaI3 = 3LaI4– + 4LaBr3 in vapors over the LaI3-CeI3-PrI3-GdI3, LaI3-GdI3-TbI3-TmI3, and LaI3-LaBr3 mixtures and the pure lanthanide triiodides were studied in the temperature range of 700–1050 K by Knudsen effusion mass spectrometry. The equilibrium constants were measured and the reaction enthalpies were calculated by the techniques of the second and third laws of thermodynamics. The standard formation enthalpies of ions, ΔfH°(298.15 K) (in kJ mol–1), were determined to be –832 ± 21 (LaI4–), –834 ± 23 (CeI4–), –834 ± 25 (PrI4–), –812 ± 24 (GdI4–), –813 ± 25 (TbI4–), –817 ± 23 (TmI4–), –806 ± 25 (LuI4–), –1399 ± 45 (La2I7–), –1402 ± 46 (Ce2I7–), –1417 ± 47 (Pr2I7–), –1356 ± 47 (Gd2I7–), –1365 ± 47 (Tb2I7–), –1366 ± 46 (Tm2I7–), and –1322 ± 47 (Lu2I7–).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Krämer, Karl

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science > 530 Physics

ISSN:

1387-3806

Publisher:

Elsevier

Language:

English

Submitter:

Karl Krämer

Date Deposited:

05 Feb 2019 13:55

Last Modified:

21 Nov 2019 04:30

Publisher DOI:

10.1016/j.ijms.2018.11.012

BORIS DOI:

10.7892/boris.123473

URI:

https://boris.unibe.ch/id/eprint/123473

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