title: Templating an N-heterocyclic carbene (NHC)-cyclometalated Cp*Ir(III)-based oxidation precatalyst on a pendant coordination platform: assessment of the oxidative behavior via electrochemical, spectroscopic and catalytic probes.
abstract: The coordination of metalloligands to derive modified properties of the metal functionality is one of the interesting strategies practiced in materials chemistry and catalysis. In this work, a pendant terpyridine ligand has been utilized for templating a Cp*Ir(III)(NHC)-based (NHC = N-heterocyclic carbene) oxidation precatalyst to assess its modified oxidative behavior via electrochemical, UV-vis spectroscopic, and catalytic probes. These studies suggested that the coordination-template enhances the electron-deficiency at the Ir(III) redox center and affects the nature of the oxidized high-valent Ir-oxo species during chemical oxidation. Moreover, both the premodified and postmodified Cp*Ir(III)(NHC)-based complexes were found to be equally efficient in catalytic sp(3) C-H oxidation reactions with NaIO4 as a mild sacrificial oxidant.
authors.affiliation: Organometallics & Smart Materials Laboratory, Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhauri, Indore By-pass Road, Bhopal 462 066, India. joyanta@iiserb.ac.in.
authors.forename: Suraj K
authors.initials: SK
authors.lastname: Gupta
authors.forename: Joyanta
authors.initials: J
authors.lastname: Choudhury