A compound is disclosed that has a metal coordination complex structure having at least two ligands coordinated to the metal; wherein the compound has a first substituent R1 at one of the ligands' periphery; wherein a first distance is defined as the distance between the metal and one of the atoms in R1 where that atom is the farthest away from the metal among the atoms in R1; wherein the first distance is also longer than any other atom-to-metal distance between the metal and any other atoms in the compound; and wherein when a sphere having a radius r is defined whose center is at the metal and the radius r is the smallest radius that will allow the sphere to enclose all atoms in the compound that are not part of R1, the first distance is longer than the radius r by at least 2.9 Å.
本发明公开了一种化合物,该化合物具有
金属配位络合物结构,其中至少有两个
配体与
金属配位;其中该化合物在
配体的一个外围具有第一取代基 R1;其中第一距离定义为
金属与 R1 中的一个原子之间的距离,该原子是 R1 中的原子中离
金属最远的原子;其中,第一距离还长于
金属与化合物中任何其他原子之间的原子到
金属的距离;以及 其中,当定义了一个半径为 r 的球体,其中心位于
金属,且半径 r 是允许该球体包围化合物中所有不属于 R1 的原子的最小半径时,第一距离比半径 r 长至少 2.9 Å.