Reduced Arene Complexes of Scandium

Overview

Journal Chemistry

Specialty Chemistry

Date 2020 Mar 12

PMID 32160350

Citations 5

Authors

Priyabrata Ghana

Alexander Hoffmann

Thomas P Spaniol

Jun Okuda

Affiliations

Soon will be listed here.

Abstract

Alkali metal naphthalenide or anthracenide reacted with scandium(III) anilides [Sc(X){N(tBu)Xy} (thf)] (X=N(tBu)Xy (1); X=Cl (2); Xy=C H -3,5-Me ) to give scandium complexes [M(thf) ][Sc{N(tBu)Xy} (RA)] (M=Li-K; n=1-6; RA=C H (3-Naph-K) and C H (3-Anth-M)) containing a reduced arene ligand. Single-crystal X-ray diffraction revealed the scandium(III) center bonded to the naphthalene dianion in a σ :π-coordination mode, whereas the anthracene dianion is symmetrically attached to the scandium(III) center in a σ -fashion. All compounds have been characterized by multinuclear, including Sc NMR spectroscopy. Quantum chemical calculations of these intensely colored arene complexes confirm scandium to be in the oxidation state +3. The intense absorptions observed in the UV/Vis spectra are due to ligand-to-metal charge transfers. Whereas nitriles underwent C-C coupling reaction with the reduced arene ligand, the reaction with one equivalent of [NEt H][BPh ] led to the mono-protonation of the reduced arene ligand.

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