Issue 40, 2021

Bonding analysis in ytterbium(ii) distannyl and related tetryls

Abstract

The syntheses of the ytterbium(II) distannyl [Yb{Sn(SiMe3)3}2·(thf)4] (Yb–Sn) and of its digermyl analogue [Yb{Ge(SiMe3)3}2·(thf)3] (Yb–Ge) are presented. The compounds were characterised by multinuclear high-resolution solution NMR spectroscopy, including 171Yb NMR, and by X-ray diffraction crystallography. The bonding and electronic properties of the two complexes, along with those of the known ytterbium(II) disilyl derivative [Yb{Si(SiMe3)3}2·(thf)3] (Yb–Si) and those of the congeneric calcium distannyl [Ca{Sn(SiMe3)3}2·(thf)4] (Ca–Sn), were investigated in detail by DFT calculations. This analysis points at a primarily ionic Yb-tetrel bonding, with a small covalent contribution, attributed principally to the 5d(Yb) participation. This weak covalent character is found to be larger for the distannyl Yb–Sn than for its lighter Si- and Ge-derivatives. The covalent component is also found to be greater in Yb–Sn than in Ca–Sn, due to the availability of the 5d(Yb) orbitals for bonding.

Graphical abstract: Bonding analysis in ytterbium(ii) distannyl and related tetryls

Supplementary files

Article information

Article type
Paper
Submitted
15 jul 2021
Accepted
11 set 2021
First published
13 set 2021

Dalton Trans., 2021,50, 14273-14284

Bonding analysis in ytterbium(II) distannyl and related tetryls

P. M. Chapple, J. Cartron, G. Hamdoun, M. Cordier, S. Kahlal, H. Oulyadi, J. Carpentier, J. Saillard and Y. Sarazin, Dalton Trans., 2021, 50, 14273 DOI: 10.1039/D1DT02355A

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