Hemilabile and bimetallic coordination in Rh and Ir complexes of NCN pincer ligands

Giulia Mancano, Michael J. Page, Mohan Bhadbhade, Barbara A. Messerle*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Two new pincer ligands have been developed that contain a central N-heterocyclic carbene (NHC) moiety linked to two pendant pyrazole groups by either a methylene (NCNme) or ethylene (NCNet) chain. The coordination of these two ligands to rhodium and iridium resulted in a variety of binding modes. Tridentate coordination of the ligands was observed in the complexes [Rh(NCNme)(COD)]BPh4 (8), [Ir(NCNme)(COD)]BPh4 (10), [Rh(NCNet)(CO)2]BPh4 (13), and [Ir(NCNme)(CO)2]BPh4 (14), and monodentate NHC coordination was observed for [Ir(NCNme)2(COD)]BPh4 (11) and [Ir(NCNet)2(COD)]BPh4 (12). Both tridentate and bidentate coordination modes were characterized for [Rh(NCNet)(COD)]BPh4 (9) in the solution and solid state, respectively, while an unusual bridging mode was observed for the bimetallic complex [Rh(μ-NCNme)(CO)]2(BPh4)2 (15). The impact of this diverse coordination chemistry on the efficiency of the complexes as catalysts for the addition of NH, OH, and SiH bonds to alkynes was explored.

Original languageEnglish
Pages (from-to)10159-10170
Number of pages12
JournalInorganic Chemistry
Issue number19
Publication statusPublished - 6 Oct 2014
Externally publishedYes


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