Label-free 3D cell imaging using hydrogels functionalized with switchable iridium complexes.

The use of fluorescent labels is the most common tool to visualize cells. However, the internalization of dye molecules often modifies the cell behavior. In this paper we demonstrate that it is possible to transiently label cells using a 3D scaffold, a hydrogel, covalently functionalized with luminescent cyclometalated iridium(III) complexes.

(BO) -Doped Tetrathia[7]helicene: A Configurationally Stable Blue Emitter.

Helicenes combine two central themes in chemistry: extended π-conjugation and chirality. Hetero-atom doping preserves both characteristics and allows modulation of the electronic structure of a helicene. Herein, we report the (BO) -doped tetrathia[7]helicene 1, which was prepared from 2-methoxy-3,3'-bithiophene in four steps.

(Dimesityl)boron Benzodithiophenes: Synthesis, Electrochemical, Photophysical and Theoretical Characterization.

Triarylboranes containing linear or angular benzodithiophene moieties and bearing one or two dimesitylboron units were synthesized. The electrochemical and optical features of these compounds were investigated by cyclic voltammetry, UV/Vis and fluorescence spectroscopy while DFT calculations were run to analyze the energetic landscape of these systems. For both linear and angular benzodithiophenes, symmetrical disubstitution leads to the highest photoluminescence yields.

Selective access to either a doubly boron-doped tetrabenzopentacene or an oxadiborepin from the same precursor.

The well-known red emitter tetrabenzo[,,,]pentacene () has been transformed into a bright blue emitter (; λ = 472 nm; c-hexane) substitutional doping with two boron atoms. In contrast to the electron-rich , which forms -peroxides with O under daylight, the benchtop-stable is a good electron acceptor and undergoes reversible reduction at a moderate half-wave potential of = -1.73 V ( FcH/FcH; THF).