High-Resolution Tuning of Iridium(III) 4'-Aryl-terpy Chromophores: A Hammett Parameter-Guided General Methodology for Systematic Property Control through Orbital Decoupling.

ABSTRACT: A series of six phenyl-substituted 4'-phenyl-2,2':6',2″-terpyridine, RPhTerpy, iridium(III) complexes of the form [Ir(RPhTerpy)(ppy)Cl](PF₆), where ppy is C^N cyclometalated 2-(phenyl)pyridine, and with Hammett parameters spanning 1.69 units, were synthesized using microwave-assisted reaction procedures and characterized via physical (cyclic voltammetry, NMR, crystallography) and photophysical methods (absorption, emission, time-correlated single photon counting, Franck-Condon line shape analysis). The iridium complexes' redox potentials, electrochemically determined ground state HOMO-LUMO gap (eHLG), photophysically determined energy gap between ground- and excited-state (E₀₀, 77 K), estimated excited-state reduction potential (E(Ir*^/

SUBMITTER: Knorr ES 

PROVIDER: S-EPMC12933883 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature