Cyclometalated iridium–BODIPY conjugates are prepared by a simple strategy and are effective ratiometric sensors for molecular oxygen.

Two pyridyl‐substituted boron dipyrromethene (BODIPY) compounds are shown to interact with the strong Lewis acid B(C6F5)3. The borane adducts are characterized by multinuclear NMR and in one case by X‐ray crystallography. The titration of pyridyl‐substituted BODIPYs with B(C6F5)3 results in a bathochromic shift of the UV/Vis absorption and emission spectra, with the magnitude of the shift depending on the distance of the bound borane from the BODIPY core. In meso‐4‐pyridyl‐BODIPY, binding of B(C6F5)3 induces a small circa 230 cm−1 red shift in the UV/Vis absorption maximum, with a much larger 1950 cm−1 shift in the photoluminescence maximum. In meso‐4‐pyridylphenyl‐BODIPY, where the pyridine Lewis base is separated from the BODIPY core by a phenyl spacer, smaller shifts of circa 120 cm−1 in UV/Vis absorption and 330 cm−1 in photoluminescence are observed. This work shows that these organic chromophores can interact with Lewis acids as a means of systematically perturbing the electronic structure and excited‐state properties.

Presented here are complexes of two different fluorinated β-diketiminate (NacNac) ligands with cyclometalated platinum. Reaction of the cyclometalated platinum dimers [Pt(C^N)(μ-X)] [C^N = 2-phenylpyridine (ppy), 2-(2,4-difluorophenyl)pyridine (Fppy); X = Cl, Br] with lithium salts of backbone-fluorinated β-diketiminate ligands produces two structure types, depending on the temperature of the reaction. At milder temperatures (<80 °C), the major product is an unusual halide-bridged diplatinum complex, demonstrating a unique NacNac binding mode bridging the two platinum centers. At higher temperatures (>100 °C), the major species is a monoplatinum complex of the type Pt(C^N)(NacNac). The complexes display reduction waves in their cyclic voltammograms at mild potentials, as well as intense visible absorption bands (λ > 500 nm), that depend minimally on the identity of the C^N ligand or, in the case of the bimetallic complexes, the identity of the bridging halide. In addition, the monoplatinum complexes exhibit structured luminescence in the red and near-infrared regions deriving a NacNac-centered triplet state. All of these observations suggest that the NacNac π system contributes substantially to the frontier orbitals and motivates continued exploration of fluorinated β-diketiminate ligands in the design of complexes with desirable ligand-based redox and optical properties.

Presented here is a new class of supramolecular cyclometalated Ir(III) complexes. The 2:1 assembies include two phosphorescent cyclometalated Ir(III) centers spanned by a BODIPY bridge with pyridine substituents at the...

The Cover Feature illustrates the interaction of pyridyl‐substituted BODIPYs with triarylborane Lewis acids. This interaction induces measurable red shifts in the UV/Vis absorption and photoluminescence, the magnitude of which depends on the strength of the Lewis acid and the proximity of the interaction to the BODIPY core. More information can be found in the Article by K. S. Choung et al. on page 86 in Issue 2, 2019 (DOI: 10.1002/cptc.201800202).