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• W2891284269 endingPage "18067" @default.
• W2891284269 startingPage "18059" @default.
• W2891284269 abstract "The suitability of aryloxide ligands for stabilizing +2 oxidation states of Sc and Y has been examined and EPR evidence indicating the first O-donor complexes of ScII and YII has been obtained, as well as an X-ray crystal structure of a ScII aryloxide complex. The trivalent rare-earth metal aryloxide precursors, Ln(OAr')3 , 1-Ln (Ln=Sc, Y, Gd, Dy, Ho, Er; OAr'=OC6 H2 tBu2 -2,6-Me-4), were synthesized from the corresponding rare-earth metal trichlorides and LiOAr'⋅OEt2 . Reduction of THF solutions of 1-Ln with potassium graphite in the presence of 2.2.2-cryptand (crypt) yielded dark-colored solutions, 2-Ln, whose EPR spectra at 77 K are characteristic of the LnII ions: a two-line spectrum (g∥ =1.99, g□ =1.97, Aave =154 G) for 2-Y and an eight-line spectrum (gave =2.01 and Aave =291 G) for 2-Sc. Solutions of 2-Y decompose within one minute at room temperature, wheras 2-Sc persists up to 40 min at room temperature. 2-Sc was identified by X-ray crystallography as [K(crypt)][Sc(OAr')3 ], which has a trigonal-planar arrangement of oxygen-donor atoms around ScII . Analogous reductions of 1-Ln for Ln=Gd, Dy, Ho, and Er also gave dark solutions of limited stability. Theoretical analysis using time-dependent density functional theory (TD-DFT) along with complete active space self-consistent field (CASSCF) methods, and structural analysis with the Guzei ligand solid angle G-parameter method are presented." @default.
• W2891284269 created "2018-09-27" @default.
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• W2891284269 date "2018-11-08" @default.
• W2891284269 modified "2023-10-18" @default.
• W2891284269 title "Rare‐Earth Metal(II) Aryloxides: Structure, Synthesis, and EPR Spectroscopy of [K(2.2.2‐cryptand)][Sc(OC ₆ H ₂ <i>t</i> Bu ₂ ‐2,6‐Me‐4) ₃ ]" @default.
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• W2891284269 doi "https://doi.org/10.1002/chem.201803807" @default.
• W2891284269 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30199585" @default.
• W2891284269 hasPublicationYear "2018" @default.
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