tetrahedral, and square planar geometries are the most often encountered coordination geometries for transition metal complexes. In certain cases, coordination equilibria can exist between different geometries, such as between six- and four-coordinate geometries in nickel(II) complexes, which were discovered half a century ago. Here, we present the first examples of a seven-five coordination equilibrium
八面体,四面体和正方形平面几何是过渡
金属配合物最常遇到的配位几何。在某些情况下,配位平衡可能存在于不同几何形状之间,例如在半个世纪前发现的
镍(II)配合物中的六和四坐标几何形状之间。在这里,我们提出了一个七到五的协调平衡的第一个例子。溶液中的大量光谱研究为两种
铁(II)配合物之间的动态平衡提供了证据,一种具有七坐标的五边形双锥体几何形状,另一种具有五坐标的三角双锥体几何形状。