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Issue 27, 2019
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Dicationic ditelluride salts stabilized by N-heterocyclic carbene

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Abstract

Treatment of 1,3-bis(2,6-diisopropylphenyl)imidazoline-2-tellone 1 with Tf2O in CH2Cl2 resulted in the formation of dicationic ditelluride salt 22+ 2 (OTf) as air-stable green crystals in 88% yield. The anion exchange reaction of 22+ 2 (OTf) with Na[B(C6F5)4] proceeded in CH3CN at room temperature giving the corresponding borate salt 22+ 2 [B(C6F5)4] as blue crystals in 40% yield. The structures of these dicationic ditelluride derivatives were fully characterized on the basis of their NMR spectroscopic data and X-ray crystallography. In the crystalline state of 22+ 2 (OTf), two NHC ligands are entirely perpendicular to the central Te–Te bond with a Te–Te–C–N torsion angle of 89.93(19)°. In sharp contrast, X-ray analysis of 22+ 2 [B(C6F5)4] revealed that two NHC ligands and the central Te–Te moiety are essentially coplanar with a Te–Te–C–N torsion angle of 7.99(17)°. In the DFT calculation for the model compound 32+, NBO orbitals around the Te–Te moiety in Ci symmetry consist of a Te–Te σ-bonding orbital, a Te–C σ-bonding orbital, a lone pair orbital on the Te atom (mainly s-character), and a lone pair orbital on the Te atom (pure p-character).

Graphical abstract: Dicationic ditelluride salts stabilized by N-heterocyclic carbene

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Publication details

The article was received on 26 Apr 2019, accepted on 14 Jun 2019 and first published on 14 Jun 2019


Article type: Paper
DOI: 10.1039/C9NJ02138H
New J. Chem., 2019,43, 10894-10898

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    Dicationic ditelluride salts stabilized by N-heterocyclic carbene

    N. Nakata, F. Kawauchi, S. Takahashi and A. Ishii, New J. Chem., 2019, 43, 10894
    DOI: 10.1039/C9NJ02138H

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