Indirect and Direct Grafting of Transition Metals to Siliconoids

摘要

Unsaturated charge‐neutral silicon clusters (siliconoids) are important as gas‐phase intermediates between molecules and the elemental bulk. With stable zirconocene‐ and hafnocene‐substituted derivatives, we here report the first examples containing directly bonded transition‐metal fragments that are readily accessible from the ‐lithiated Si siliconoid ( ) and Cp MCl (M=Zr, Hf). Charge‐neutral siliconoid ligands with pending tetrylene functionality were prepared by the reaction of amidinato chloro tetrylenes [PhC(N Bu) ]ECl (E=Si, Ge, Sn) with , thus confirming the principal compatibility of such low‐valent functionalities with the unsaturated Si cluster scaffold. The pronounced donor properties of the tetrylene/siliconoid hybrids allow for their coordination to the Fe(CO) fragment.