Lanthanide Contraction in Lanthanide Organic Frameworks: A Theoretical and Experimental Study

In this work, the lanthanide (Ln) contraction phenomenon has been analyzed for three-dimensional structures in the solid state. We chose to study an isostructural series of lanthanide organic frameworks (LOFs) of formula [Ln2(C4H4O4)3(H2O)2] n ·H2O and 14 crystallographic structures (except promethi...

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Veröffentlicht in:	The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2020-09, Vol.124 (38), p.7678-7684
Hauptverfasser:	Silva, Gustavo S, Dutra, José Diogo L, Freire, Ricardo O
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Sprache:	eng
Schlagworte:	A: Spectroscopy, Molecular Structure, and Quantum Chemistry
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container_title	The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
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creator	Silva, Gustavo S Dutra, José Diogo L Freire, Ricardo O
description	In this work, the lanthanide (Ln) contraction phenomenon has been analyzed for three-dimensional structures in the solid state. We chose to study an isostructural series of lanthanide organic frameworks (LOFs) of formula [Ln2(C4H4O4)3(H2O)2] n ·H2O and 14 crystallographic structures (except promethium complex). The analysis of Ln contraction was made by analyzing the sum of all Ln–O bond lengths and the sum of all O–O distances, for the oxygen atoms of the coordination polyhedra, calculated with different semiempirical quantum mechanical models. The ∑Ln–O and ∑O–O for this LOF can be fit to a second-order polynomial. Based on the crystallographic structures, it is concluded that the phenomenon of Ln contraction is observed. Our results also suggest that the semiempirical Sparkle/PM3 and Sparkle/RM1 models reproduce the Ln contraction phenomenon well, and similar fits were obtained for ∑Ln–O and ∑O–O bond lengths.
doi_str_mv	10.1021/acs.jpca.0c05065
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title	Lanthanide Contraction in Lanthanide Organic Frameworks: A Theoretical and Experimental Study
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