Iridium complexes of acridine-based PNP-type pincer ligands: Synthesis, structure and reactivity

Yarden Lavi, Michael Montag, Yael Diskin-Posner, Liat Avram, Linda J.W. Shimon, Yehoshoa Ben-David, David Milstein

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Acridine-based PNP-type pincer ligands (AcrPNP) have previously been used for the construction of a small number of Ru(II), Mn(I), Rh(III) and Ir(III) complexes, with most attention being given to the catalytically-active ruthenium complexes. In the present work, we significantly expand the scope of known AcrPNP complexes by introducing a series of new Ir(I) and Ir(III) complexes. These were synthesized from two AcrPNP ligands differing in their P-substituents (iPr vs Ph), in conjunction with various Ir(I)-olefin precursors, through different sequences of reactions that include intramolecular C[sbnd]H activations and additions of H2 and NaBEt3H. The new iridium complexes, with their observed structures and reactivities, reflect the unique properties of the acridine-based PNP ligands, i.e., their inherent structural flexibility and ability to support both metal-centered reactivity (C[sbnd]H and H[sbnd]H oxidative addition) and ligand-centered reactivity (hydride- and H2-induced dearomatization).

Original languageEnglish
Article number121787
JournalInorganica Chimica Acta
StatePublished - 1 Jan 2024
Externally publishedYes


  • AcrPNP
  • C–H activation
  • H addition
  • Iridium complex
  • Oxidative addition
  • PNP pincer


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