摘要： Two pyridyl-substituted 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 ca. 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 ca. 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.