Reaction between Cp*TaCl4 (Cp* = η5-C5H5) and BH3·thf at 40 °C yields the pale red electronically unsaturated cluster Cp*TaCl2B4H8 1 which despite having two electrons fewer than the seven pairs required for the observed square pyramidal geometry is stable in air; viewed as a cluster, 1 is the first example of an unsaturated cluster containing a single metal atom; viewed as a chiral 16-electron organometallic complex it is isoelectronic with Cp(C2B9H11)TaCl2 and Cp[(Me3Si)2C2B4H4]TaCl2.
Cp*TaCl4(Cp* = η5-
C5H5)和
BH3·thf在40 °C下的反应生成浅红色的电子不饱和簇Cp*TaCl2B4H8 1,尽管它比观察到的正方锥几何所需的七对电子少两个,但在空气中是稳定的;作为簇,1是不饱和簇中第一个包含单个
金属原子的例子;作为手性16电子有机
金属络合物,它与Cp(C2
B9H11)TaCl2和Cp[(Me3Si)2C2B4H4]TaCl2具有相同的电子数。