14396-22-6Relevant articles and documents
Electron Diffraction Study of the Molecular Structures of Monomethylsilyl Isocyanate and Monomethylsilyl Isothiocyanate in the Gas Phase
Anderson, David G.,Cradock, Stephen,Huntley, Christopher M.,Rankin, David W. H.
, p. 1193 - 1198 (2007/10/02)
The molecular structures of the methylsilyl pseudohalides SiH2MeNCO and SiH2MeNCS have been determined by electron diffraction in the gas phase.The molecules appear bent at nitrogen, but it is shown that this is probably due to a shrinkage effect caused by a low-frequency, large amplitude bend at nitrogen, as found for the simple silyl analogues SiH3NCY (Y=O or S).The major structual parameters (ra, bond lengths in pm, angles in degrees) are: SiH2MeNCO, r(Si-N) 171.8(2), r(Si-C) 185.3(3), r(N=C) 121.3(23), r(C=O) 116.9(18), Si-N-C 151.7(16), N-Si-C 104.5(21); SiH2MeNCS, r(Si-N) 172.4(6), r(Si-C) 184.8(8), r(N=C) 119.5(4), r(C=S) 157.8(3), Si-N-C 156.4(16), N-Si-C 108.5(14).In each case the torsion angle between the plane containing the SiC and SiN bonds and that containing the SiN and N=C bonds is close to 90 deg.Comparisons are drawn with other pseudohalides MeHnMe3-nNCY, where M=Si or C and n=0-3.
