In this section we compare the obtained molecules in terms of photophysical properties and NO generation efficiency. Figure shows the normalized absorption spectra in ethanol. All compounds have high molar extinction coefficient at ~510-520 nm (Ошибка! Источник ссылки не найден.). A slight hypochromic shift is observed upon boron methylation. The fastest and the most efficient NO photorelease is observed for BODIPY-NOD-2 (~20% total for 2 min), whereas BODIPY-NOD-4 shows the same speed but lower total yield (~4% total for 2 min). Compound 2b (the photoproduct of BODIPY-NOD-2) was photostable in EtOH, and the fluorescence of DAR-2 probe did not change upon its illumination.