Low-Coordinate Mixed Ligand NacNac Complexes of Rare Earth Metals

Svetlana V Klementyeva; Taisiya S Sukhikh; Pavel A Abramov; Andrey I Poddel'sky

doi:10.3390/molecules28041994

Low-Coordinate Mixed Ligand NacNac Complexes of Rare Earth Metals

Molecules. 2023 Feb 20;28(4):1994. doi: 10.3390/molecules28041994.

Authors

Svetlana V Klementyeva^{1

2}, Taisiya S Sukhikh³, Pavel A Abramov³, Andrey I Poddel'sky¹

Affiliations

¹ Chemistry Department, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
² Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany.
³ Nikolaev Institute of Inorganic Chemistry SB RAS, Akademika Lavrentieva Ave. 3, 630090 Novosibirsk, Russia.

Abstract

We report the synthesis and characterization of two types of new mixed-ligand rare earth complexes: tetracoordinate (NacNac^Mes)Ln(BIAN^dipp) (Ln = Dy (1), Er (2) and Y (3)) and pentacoordinate (NacNac^Mes)Ln(AP^dipp)(THF) (Ln = Dy (4), Er (5) and Y (6)). The first three compounds were prepared by the reaction of [(BIAN^Dipp)LnI] with potassium β-diketiminate. The salt metathesis of β-diketiminato-supported rare earth dichlorides (NacNac^Mes)LnCl₂(THF)₂ with sodium o-amidophenolate results in compounds 4-6. The crystal structures of complexes 1-6 were determined by single-crystal analysis. The combination of bulky monoanionic N-mesityl-substituted β-diketiminates with sterically hindered redox-active ligands led to the very low coordination numbers of rare earths and strong distortion of the chelate ligands.

Keywords: X-ray; mixed-ligand; rare earth; redox-active ligand; synthesis; β-diketiminate.

MeSH terms

Crystallography, X-Ray
Ligands
Metals, Rare Earth* / chemistry
Models, Molecular

Substances

Ligands
1,3-di(4-imidazolinophenoxyl)propane
Metals, Rare Earth

Grants and funding

project GSO/KT37/Klaus Tschira Foundation