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Abstract
A stable silicon(II) monohydride is accomplished through a covalent shared interaction of the silylene lone-pair and a sp(3)-hybridized boron atom of the Lewis acidic BH(3). Experimental charge density investigations reveal a central positively charged silicon atom bound to a negatively charged hydrogen atom. The positively charged H-Si-BH(3) moiety is coordinated by the lone-pairs of electrons of the benzamidinate ligand. This coordination is reinforced by a transannular Si1···C1 privileged exchange channel.
Highlights
The chemistry of silicon(II) dihydride has been studied at high temperature or in a matrix at very low temperatures, but it has been so far elusive at room temperature
The positively charged H–Si–BH3 moiety is coordinated by the lone-pairs of the benzamidinate ligand
In 2006, we reported the synthesis of a chlorosilylene, LSiCl (1) with a stereoactive lone-pair present at the silicon atom.[6]
Summary
The chemistry of silicon(II) dihydride has been studied at high temperature or in a matrix at very low temperatures, but it has been so far elusive at room temperature. Charge density investigations from a highresolution low-temperature diffraction experiment reveals that there seems to be only one consistent interpretation of the electronic structure: LSiH(BH3) is the first silicon(II) monohydride, containing a central Si atom. It is stabilized through a covalent shared interaction to a sp3-hybridized boron atom. The positively charged H–Si–BH3 moiety is coordinated by the lone-pairs of the benzamidinate ligand. These non-shared interactions allow a much more flexible coordination geometry at the silicon atom
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