Cyclopentadienyl (Cp) ligands have received considerable attention mainly because of their pi six-electron donation capability. Tris(pyrazolyl)borate ligands (Tp) are often compared with Cp because of their identical charge, number of donated electrons, and similar facial coordinating geometry. Their six-electron donation, however, is formally sigma-type. The X-ray structure of the [TpCF3,CH3CuK(mu
                                    环戊二烯基(Cp)
配体已受到相当大的关注,这主要是因为它们具有pi六电子给体能力。通常将三(
吡唑基)
硼酸酯配体(Tp)与Cp进行比较,因为它们具有相同的电荷,给定的电子数和相似的面部配位几何形状。但是,他们的六电子捐赠形式上是sigma类型。[TpCF3,   CuK(mu 4-
CO3)KTpCF3,   ] 2聚集体的X射线结构首次揭示了前所未有的eta 5-TpCF3,
CH3钾键相互作用。1在三边形空间群P1中结晶,其中a = 12.0411(2)A,b = 14.9791(2)A,c = 16.0567(3)A,alpha = 71.301(1)度,beta = 69.785(1)度,伽玛= 66.539(1)度,Z =2。KF和K-mu 4-   (2-)相互作用均能稳定聚集体,如缺乏
氟基团或当O = 
CO2(2-)被   -   -取代时缺少六核聚集和K结合所暗示的。在后一种情况