Reduction chemistry yields stable and soluble divalent lanthanide tris(pyrazolyl)borate complexes. Issue 15 (2nd February 2023)

• Record Type: Journal Article
• Authors: Chowdhury, Tajrian; Evans, Matthew J.; Coles, Martyn P.; Bailey, Anna G.; Peveler, William J.; Wilson, Claire; Farnaby, Joy H.
• Is Part Of: Chemical communications. Volume 59:Issue 15(2023)
• Page Start: 2134
• Page End: 2137
• Publication Date: 2023-02-02
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/d2cc03189b
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : Reduction of heteroleptic Ln(iii ) [Ln(Tp)2 (OTf)] (Tp = hydrotris(1-pyrazolyl)borate; OTf = triflate) with either an Al(i ) anion or KC8 yielded the adduct-free Ln(ii ) complexes dimeric 1-Eu [{Eu(Tp)( μ-κ 1 : η 5 -Tp)}2 ] and monomeric 1-Yb [Yb(Tp)2 ]. 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-κ 1 : η 5 -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 Ph3 PO 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-κ 1 : η 5 -coordination mode of the unsubstituted Tp ligand to lanthanides in 1-Eu .