Oxygen-dependent fluctuation of labile Fe(ii) was visualized by a new N-oxide-based fluorescent probe for Fe(ii) ion.

Fluctuation of labile Fe(ii) at Golgi apparatus was specifically detected by a new fluorescent probe.

Bismuth-rhodamine (BiR) was developed as a new photosensitizer scaffold, and its photophysical properties were evaluated. BiR showed significant red-shifted absorption and emission compared with other xanthene-based photosensitizers, together with an efficient quantum yield for the generation of O. BiR showed efficient cell-permeability as well as photo-triggered generation of O in cells.

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