Embodiments of the invention are directed to ONO pincer ligands that can be in a trianionic, protonated or protonated equivalent form. The ONO pincer ligand can be combined with a transition metal comprising compound to form an ONO pincer ligand comprising transition metal complex. By choice of the ONO pincer ligand structure, the steric and electronic properties of the transition metal complexes therefrom can be controlled. The ONO pincer ligands comprise a central nitrogen atom that is disubstituted with a pair of three atom comprising bridges where the three atoms are three sp
2
hybridized carbons or the three atoms are a pair of sp
2
hybridized carbons and an sp
3
hybridized carbon or silicon.
本发明的实施例涉及可以处于三阴离子、质子化或质子化等效形式的ONO夹持
配体。ONO夹持
配体可以与含有过渡
金属的化合物结合,形成含有过渡
金属的ONO夹持
配体配合物。通过选择ONO夹持
配体结构,可以控制过渡
金属配合物的立体和电子性质。ONO夹持
配体包括一个中心氮原子,该中心氮原子被一对三原子桥连接,其中三个原子是三个sp2杂化碳或一对sp2杂化碳和一个sp3杂化碳或
硅原子。