The crystal structures of four Cu(II) complexes and one Ni(II) complex bearing a square planar N2O2 coordination sphere are discussed. In all cases a distorted square planar coordination sphere is observed that is independent of the metal centre and the ligand and is only influenced by the packing of the molecules in the crystal. For the less distorted copper complexes metal–aromatic interactions are observed, while no significant intermolecular interactions are found for the nickel complexes. This can be explained by the different electronic character of Cu(II) and Ni(II) and is also reflected in the differences in the solvatochromism of these complexes.
讨论了带有方形平面
N2O2 配位球的四种 Cu(II) 配合物和一种 Ni(II) 配合物的晶体结构。在所有情况下,都会观察到扭曲的方形平面配位球,该配位球与
金属中心和
配体无关,并且仅受晶体中分子堆积的影响。对于扭曲较小的
铜络合物,观察到
金属-芳香族相互作用,而对于
镍络合物,没有发现显着的分子间相互作用。这可以通过 Cu(II) 和 Ni(II) 的不同电子特性来解释,也反映在这些络合物溶剂化显色性的差异上。