Abstract
Pincer complexes of transition metals have demonstrated valuable catalytic reactivities and desirable properties as functional materials. Much more is known about pincer complexes of noble metals, but the pincer chemistry of nonprecious, 3d metals is poised for rapid growth over the next decade. This chapter presents a literature survey of nickel complexes based on tridentate ECE-type pincer ligands featuring a meridional coordination of the central metal atom through two dative E → Ni interactions and a covalent C–Ni linkage. The discussion is focused on the synthesis, characterization, and reactivities of complexes featuring both symmetrical and unsymmetrical ligands, ECE and ECE′. The material is organized into various sections according to the type of donor moiety E and E′ (phosphine, amine, phosphinite, phosphinimine, thioether, and N-heterocyclic carbene) and the hydrocarbyl linker (aromatic or aliphatic). Where possible, the presentation reflects the chronological order of the developments in this field of study. The review concludes with an overview of the current state of the chemistry of (ECE)Ni complexes and offers some predictions on the future prospects of this field.
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Acknowledgments
The authors wish to thank the Natural Sciences and Engineering Research Council of Canada for financial support of our studies on pincer complexes of nickel. We recognize gratefully all those collaborators who have helped us in our studies, including those whose unpublished results are cited in this review, as well as those pioneers of pincer chemistry whose discoveries have inspired our own work.
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Zargarian, D., Castonguay, A., Spasyuk, D.M. (2013). ECE-Type Pincer Complexes of Nickel. In: van Koten, G., Milstein, D. (eds) Organometallic Pincer Chemistry. Topics in Organometallic Chemistry, vol 40. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31081-2_5
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