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A new class of bi-luminophoric dyad has been designed, consisting of an oxygen-sensitive phosphorescent NHC-IrIII center with a remotely integrated oxygen-insensitive fluorescent terpyridine unit. The new terpyridine flurophore-integrated NHC-IrIII molecule was demonstrated as a potential ratiometric O2 probe with built-in internal reference, exhibiting tunable dual-emissive features, as well as highly linear and reversible O2-response behavior. [ABSTRACT FROM AUTHOR]

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*IrIII(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 IrIII redox center and affects the nature of the oxidized high-valent Ir-oxo species during chemical oxidation. Moreover, both the premodified and postmodified Cp*IrIII(NHC)-based complexes were found to be equally efficient in catalytic sp3 C-H oxidation reactions with NaIO4 as a mild sacrificial oxidant. [ABSTRACT FROM AUTHOR]

The reaction of a series of pyridine-appendedimidazolium saltswith Pd(COD)Cl2in the presence of KOtBu as base led to hydrolytic ring-opening followed by a newtype of pincer tridentate (N,C,O) bonding of the in situgenerated formamide-based new ligands toward the metal center. Thisunprecedented type of bonding resulted from a vinylic C–H activationby palladium stabilized with coordination from the pyridine nitrogenand aldehyde oxygen donors in a pincer fashion. The new stable, square-planarpalladium(II) complexes (1–3) werecharacterized by 1D and 2D NMR spectroscopic and high-resolution massspectrometric (HRMS) methods. The single-crystal X-ray structure ofa representative complex (2) confirmed the above interestingbonding features. [ABSTRACT FROM AUTHOR]

A new class of bi-luminophoric dyad has been designed, consisting of an oxygen-sensitive phosphorescent NHC-Ir III center with a remotely integrated oxygen-insensitive fluorescent terpyridine unit. The new terpyridine flurophore-integrated NHC-Ir III molecule was demonstrated as a potential ratiometric O 2 probe with built-in internal reference, exhibiting tunable dual-emissive features, as well as highly linear and reversible O 2 -response behavior., (© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)