Designingc hromophores for biological applications requires af undamental understanding of how the chemical structure of ac hromophore influences its photophysical properties. We here describe the synthesis of al ibrary of BODIPY dyes, exploring diversity at variouspositions around the BODIPY core. The results show that the nature and positiono fs ubstituents have ad ramatic effect on the spectroscopicp roperties. Substituting in ah eavy atom or adjusting the size and orientation of ac onjugated system provides am eans of alteringt he spectroscopic profiles with high precision. Thei nsight from the structure-activity relationshipw as appliedt od evise an ew BODIPY dye with rationally designed photochemical properties including absorptiont owardst he near-infraredr egion. The dye also exhibiteds witch-onf luorescencet oe nable visualisation of cells with high signal-to-noise ratio without washing-outo f unboundd ye. The BODIPY-based probe is non-cytotoxic and compatible with staining procedures including cell fixation and immunofluorescencemicroscopy.Supporting information and the ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.
Two bodipy dyes with different carboxylic acids on the meso-position of the bodipy core were prepared and used to sensitize TiO2 photoelectrodes. On the basis of spectroscopic characterization, the photoelectrodes were used to fabricate photoelectrochemical cells (PECs) for solar light harvesting. Photovoltaic measurements showed that both bodipy dyes successfully sensitized PECs with short-circuit current densities (JSC) two-fold higher compared to the control. The increase in generated current was attributed to the gain in spectral absorbance due to the presence of bodipy. Finally, the influence of co-sensitization of bodipy and N719 dye was also investigated and photovoltaic device performance discussed.
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