A stable silicon(ii) monohydride

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.

Facile Access to the Functionalized N-Donor Stabilized Silylenes PhC(NtBu)2SiX (X = PPh2, NPh2, NCy2, NiPr2, NMe2, N(SiMe3)2, OtBu)

“…8f The bond lengths between the chelating nitrogens atom and silicon are nearly identical (Si1−N2 = 1.8614(11) Å and Si1−N1 = 1.8626(11) Å) and are longer than Si−N single bonds in silicon(IV) amines 19 and present lone-pair-driven dative N→Si bonds. 20 The bite angle N1−Si1−N2 is 69.81(4)°. The Si atom is shifted out of the plane defined by N1−C1−N2 of 0.3515(24) Å.…”

Lithium Complex of an Abnormal Carbene

“…The Li-O av and Li(1)-C(3) bond lengths are 1.983 and 2.122(3) Å, respectively, which is quite comparable to the bond lengths reported in the literature. [12] The boron atom is also four coordinate [13] and has a distorted tetrahedral geometry that comprises three hydrogen atoms and one carbon atom. The carbon-boron bond length in 3 is 1.6041(19) Å.…”

Efficient Synthesis of a NHC‐Coordinated Trisilacyclopropylidene and Its Coordination Behavior

“…In comparison to other silicon(II)s pecies [13,18,24,25] coordinated to BH 3 units the 11 BNMR signal of the BH 3 moiety in 3 and 4 is shifted downfield by around 10-14ppm. The SiÀSi bond lengths (2.381(8)-2.421(8) in 3 and 2.361(5)-2.391(5) in 4)a re somewhat elongated compared to those in 1.I nt he NMR spectra for 3 and 4 similarr esonances were detectedi nC 6 D 6 .…”