Issue 15, 2023

Reduction chemistry yields stable and soluble divalent lanthanide tris(pyrazolyl)borate complexes

Abstract

Reduction of the heteroleptic Ln(III) precursors [Ln(Tp)2(OTf)] (Tp = hydrotris(1-pyrazolyl)borate; OTf = triflate) with either an aluminyl(I) anion or KC8 yielded the adduct-free homoleptic Ln(II) complexes dimeric 1-Eu [{Eu(Tp)(μ-κ1:η5-Tp)}2] and monomeric 1-Yb [Yb(Tp)2]. Complexes 1-Ln have good solubility and stability in both non-coordinating and coordinating solvents. Reaction of 1-Ln with 2 Ph3PO yielded 1-Ln(OPPh3)2. All complexes are intensely coloured and 1-Eu is photoluminescent. The electronic absorption data show the 4f–5d electronic transitions in Ln(II). Single-crystal X-ray diffraction data reveal first μ-κ1:η5-coordination mode of the unsubstituted Tp ligand to lanthanides in 1-Eu.

Graphical abstract: Reduction chemistry yields stable and soluble divalent lanthanide tris(pyrazolyl)borate complexes

Supplementary files

Article information

Article type
Communication
Submitted
06 Jun 2022
Accepted
19 Dec 2022
First published
30 Jan 2023
This article is Open Access
Creative Commons BY license

Chem. Commun., 2023,59, 2134-2137

Reduction chemistry yields stable and soluble divalent lanthanide tris(pyrazolyl)borate complexes

T. Chowdhury, M. J. Evans, M. P. Coles, A. G. Bailey, W. J. Peveler, C. Wilson and J. H. Farnaby, Chem. Commun., 2023, 59, 2134 DOI: 10.1039/D2CC03189B

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