Silicon–Oxygen Double Bonds: A Stable Silanone with a Trigonal‐Planar Coordinated Silicon Center

Abstract

SiO in a complex: The first silanone that is stable at room temperature (3) is reported. The two-step synthesis involves carbonylation of the silylidyne complex 1 to give the chromiosilylene 2, followed by oxidation of 2 with N2 O. Silanone 3 features a polar, short SiO bond (1.526(3) Å) to a trigonal-planar-coordinated silicon center and reacts with water to give the dihydroxysilyl complex.

An Isolable Bis(Silanone–Borane) Adduct

“…The silicon center in 3 adopts a distorted tetrahedral geometry with a short Si−O distance of 1.557(4) and 1.537(4) Å in accordance with related four‐coordinated Lewis acid stabilized silanones (1.531–1.579 Å) containing a Si=O double bond . The Si−O distance is only slightly elongated when compared with recently reported genuine silanones (1.518–1.537 Å) . Bis(silanone) 3 is remarkable stable in solution ([D 8 ]THF) and no changes in the 1 H NMR spectra were observed upon heating to 60 °C.…”

NHC‐Stabilised Silyliumylidene Ions

“…Examples of sulphur activation by Driess ( III ) and So ( VI ), and silylene‐like coordination to transition metals by So ( VI ) have been reported and show the promise of silyliumylidene chemistry (Scheme , b and c). Filippou's compound VII reacts with N 2 O to give a metal‐substituted compound bearing a Si−O double bond in a silaacylium ion XXIV (Scheme , d) …”

Gas bubble formation in fused silica generated by ultra-short laser pulses

“…The authors believe that this has to do with certain additives such as B 2 O 3 , Na 2 O, K 2 O and Al 2 O 3 present in these glass types. It is imaginable that one of these elements (boron, sodium, potassium or aluminum) could bind dissolved atomic and/or ionic oxygen faster than pure silicon or silicon oxide as no double bonds are required [12,13]. However, it must be assumed that the reaction equilibrium -depending among others on the melt temperature -is affected also by the cool down rate, the viscosity of the melt as well as the solubility of atomic and or molecular oxygen in the melt.…”

“…In order to exist in a single molecule state the SiO 2 molecule would have to form double bonds to each of the oxygen atoms (similar to CO 2 ). However, theoretical and experimental analysis shows that Si = O (double) bonds are very instable already at room temperature [12,13]. Consequently, should ) the calculation will yield only the minimum amount of substance of freed oxygen.…”