Molecular and ionic sublimation of the lanthanide triiodides. Thermochemical properties of LnI3 and Ln2I6 molecules and LnI4– and Ln2I7– ions

Motalov, V.B.; Kudin, L.S.; Dunaev, A.M.; Butman, M.F.; Krämer, K.W. (2021). Molecular and ionic sublimation of the lanthanide triiodides. Thermochemical properties of LnI3 and Ln2I6 molecules and LnI4– and Ln2I7– ions. International journal of mass spectrometry, 465, p. 116606. Elsevier 10.1016/j.ijms.2021.116606

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The results of systematic investigations of the molecular and ionic sublimation of lanthanide triiodides LnI3 (Ln = La-Lu) by Knudsen effusion mass spectrometry are summarized. The LnI3 monomer and Ln2I6 dimer molecules as well as the associated LnI4- and Ln2I7- ions are the main constituents of saturated vapor. The total fraction of ions is negligible compared to that of neutral species. The partial vapor pressures of the molecules and the equilibrium constants of ion-molecular reactions are determined. On the basis of a joint analysis of all vaporization thermodynamics data obtained in the period from 1952 to 2020, the sublimation enthalpies DsHo(298.15 K) of LnI3 in the form of monomer and dimer molecules are recommended. The standard thermochemical properties such as the formation enthalpy and atomization/dissociation enthalpy of the molecules and ions are obtained. The variation of these properties along the lanthanide series is discussed.

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:

23 Jun 2021 19:16

Last Modified:

27 Jun 2021 03:08

Publisher DOI:

10.1016/j.ijms.2021.116606

BORIS DOI:

10.48350/156928

URI:

https://boris.unibe.ch/id/eprint/156928

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