The styryl dye RH237 is a fast-responding potentiometric probe that is primarily used for functional imaging of neurons. Excitation/emission data (below)  is for the dye in methanol. In cell membranes, the spectra of styryl dyes are typically blue-shifted by as much as 20 nm for absorption or excitation and 80 nm for emission.

• λ_Ex/λ_Em (MeOH) = 528/782 nm
• Dark solid soluble in DMSO
• Store at -20°C and protect from light
• C₂₉H₄₀N₂O₃S
• MW: 496.71

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