The Monoanionic ECE-Pincer Ligand: A Versatile Privileged Ligand Platform-General Considerations

Abstract

During the past 40 years, the monoanionic, tridentate ligand platform that has been named “Pincer” has established itself as a privileged ligand in a variety of research and application areas. Exciting discoveries with NCN and PCPpincer metal complexes in the late 1970s created a firm basis for the tremendous development of the field. Some of the basic findings are summarized with emphasis on the organometallic aspects of the ECE-pincer metal system.