Silylenes bond angles

Silylenes Bond angles Si-H Bond length, nm Si-X References... 

Again dismissing semi-empirical and STO-3G models, calculations and experiment are in close accord with regard to bond angles in silylene (near to 90°) and its difluoro and dichloro analogues (near to 100°). 

Table 2 Experimental and calculated geometries of N-heterocyclic silylenes using different methods (bond lengths in pm, bond angles in degrees)...

Metal-catalyzed silylene extrusion from hexamethylsilirane 20 was also used to generate transition metal silylenoids [equation (7.2)] 47 In the presence of a metallo-porphyrin, [Os(TTP)]2 (where TTP = the dianion of meso-tetra-p-tolylporphyrin), hexamethylsilirane 20 extruded dimethylsilylene to produce the THF-stabilized osmium silylenoid complex 21. Despite the coordinated THF molecule, crystallographic analysis of the silylosmium complex 21 revealed the sp2 nature of the silicon atom (Os-C-Si bond angles 121° and 117°). Osmium silylenoid 21 was also synthesized from the reaction of [Os(TPP)]2- and dimethyldichlorosilane.47... 

M M Distances and M-Si-M Bond Angles in Bridged Silylene Complexes"... 

Dependent on the bond angle and the composition, silylenes belong to the following point groups ... 

FIGURE 54. Transition structures and reaction profiles for hydrogen abstraction from methane and silane by triplet silylene and methylene. Bond lengths are in A, bond angles in deg, energy in kcal mol"1. Reprinted with permission from J. Am. Chem. Soc., 106, 4054 (1984). Copyright (1984) American Chemical Society297. 

TABLE 3. Bond Angles and Bond Lengths of Silylenes in Their Ground Electronic States... 

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