Abstract: The HF/6-311+G^*basis set was used to study the complexes of silylene, ¹SiH₂, with first row-transition-metaLIons. The MSiH₂can be regarded as the result of coordination of ¹SiH₂with metaLIons, and are of coplanar structure. Their M=Si bonds are obviously of double bond characteristic. M=Si bond dissociation energies appear in periodic trends from Sc to Cu, and have an approximate linear relationship with metaLIon promotion energies.

Key words: Transition-metal silylene ion, Geometry, Bond dissociation energy, Ab initio