NIR-Emitting Cyclometalated Cp*-Ir(III) Complexes: Impact of Ligand π-Extension on Aggregation Behavior and Photophysical Properties.

ABSTRACT: Half-sandwich iridium complexes exhibit poor photophysical properties. We reported the first case of half-sandwich cyclometalated iridium complexes with anticancer photodynamic activity, using two π-expansive ligands differing by one extra ring in [Cp*Ir(C^N)L]BF₄ complexes. Considering the ability of the ligands to aggregate through π-π interactions, which may reduce the emission energy, and the interest in NIR emitters, we envisaged to study the concentration-dependent solution and solid state photophysical properties. Besides emission, aggregation was verified by ¹H NMR, PFGSE-DOSY NMR experiments, X-ray diffraction, and DLS. It was found by X-ray diffraction the formation, with pair of enantiomers, of head-to-tail dimers that were further aggregated in some

SUBMITTER: Gonzalo-Navarro C 

PROVIDER: S-EPMC12914635 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature