We describe a method based on a caged fluorescent molecule that can act as a chemical two-photon probe. It is composed of an organic fluorophore and a ruthenium-bipyridine complex that acts as a photoremovable quencher. For the fluorophore to be emissive, two independent photons must act on the molecule: the first photon frees the fluorescent ligand from the Ru complex and the second photon excites the fluorescence.
View Article and Find Full Text PDFRuthenium bis(bipyridine) complexes have proved to be useful as phototriggers for visible and IR-light photodelivery of molecules. They usually expel one ligand heterolytically upon absorption of blue or green light. However, their absorption capabilities at wavelengths longer than 500 nm are poor.
View Article and Find Full Text PDFWe describe a complete system for optical pH manipulation and imaging. The system consists of a photoactive Ruthenium complex capable of inducing a change of more than 5 pH units at the nanosecond time scale. A compatible imaging system acquires microscopic pH images at 1200 fps using a nonexpensive commercial digital camera and an LED illumination system.
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