Molecular and ionic sublimation of neodymium, dysprosium, holmium, and erbium triiodides and thermochemistry of molecules and ions

Motalov, V.B.; Dunaev, A.M.; Kudin, L.S.; Butman, M.F.; Krämer, K. W. (2020). Molecular and ionic sublimation of neodymium, dysprosium, holmium, and erbium triiodides and thermochemistry of molecules and ions. International journal of mass spectrometry, 457, p. 116431. Elsevier 10.1016/j.ijms.2020.116431

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The molecular and ionic sublimation of neodymium, dysprosium, holmium, and erbium triiodides was studied by Knudsen effusion mass spectrometry. The monomer LnI3, dimer Ln2I6, and trimer Ln3I9 molecules and the ions LnI4– and Ln2I7– were found to be constituents of the saturated vapors in each case. The partial pressures of the vapor species and the equilibrium constants of the ion-molecular reactions were calculated. On the basis of a joint analysis of all literature data, the sublimation enthalpies ΔsHo(298.15 K)/(kJ mol−1) are recommended as 293 ± 3 (NdI3), 387 ± 30 (Nd2I6), 281 ± 3 (DyI3), 353 ± 12 (Dy2I6), 281 ± 3 (HoI3), 352 ± 6 (Ho2I6), 278 ± 4 (ErI3), and 350 ± 30 (Er2I6). The standard formation enthalpies ΔfHo(298.15 K)/(kJ mol−1) of the molecules and ions were determined to be −346 ± 5 (NdI3), −891 ± 30 (Nd2I6), −815 ± 23 (NdI4–), −1379 ± 46 (Nd2I7–), −336 ± 4 (DyI3), −880 ± 12 (Dy2I6), −811 ± 23 (DyI4–), −1360 ± 46 (Dy2I7–), −342 ± 4 (HoI3), −894 ± 7 (Ho2I6), −814 ± 23 (HoI4–), −1372 ± 46 (Ho2I7–), −341 ± 5 (ErI3), −888 ± 30 (Er2I6), −819 ± 23 (ErI4–), and −1377 ± 46 (Er2I7–).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

1387-3806

Publisher:

Elsevier

Language:

English

Submitter:

Karl Krämer

Date Deposited:

17 Nov 2020 14:39

Last Modified:

22 Nov 2020 02:50

Publisher DOI:

10.1016/j.ijms.2020.116431

BORIS DOI:

10.7892/boris.148069

URI:

https://boris.unibe.ch/id/eprint/148069

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