Five-Coordinate Silicon(II) Compounds with Si–M Bonds (M = Cr, Mo, W, Fe): Bis[N,N′‑diisopropylbenzamidinato(−)]silicon(II) as a Ligand in Transition-Metal Complexes

Reaction of the donor-stabilized
silylene 1 with [Cr­(CO)6], [Mo­(CO)6], [W­(CO)6], or [Fe­(CO)5] leads to the formation
of the transition-metal silylene complexes 2–5, which contain five-coordinate silicon­(II) moieties with
Si–M bonds (M = Cr, Mo, W, Fe). These compounds were characterized
by NMR spectroscopic studies in the solid state and in solution and
by crystal structure analyses. These experimental investigations were
complemented by computational studies to gain insight into the bonding
situation of 2–5. The nature of the
Si–M bonds is best described as a single bond.

供体稳定硅二烯1与[Cr­(CO)6]、[Mo­(CO)6]、[W­(CO)6]或[Fe­(CO)5]的反应生成了过渡金属硅二烯络合物2-5，这些络合物包含具有Si-M键（M = Cr、Mo、W、Fe）的五配位硅(II)基团。这些化合物通过固态和溶液中的核磁共振光谱研究以及晶体结构分析进行了表征。这些实验研究通过计算研究得到补充，以深入探究2-5的成键情况。Si-M键的性质最适宜描述为单键。