A Family of Highly Fluorescent and Unsymmetric Bis(BF2) Chromophore Containing Both Pyrrole and N-Heteroarene Derivatives: BOPPY

), large Stokes shifts, excellent photostability, and insensitivity to pH. More importantly, these BOPPYs showed efficient two-photon absorption in the wide spectral range of 700-900 nm, making them well suited for two-photon fluorescence microscopy imaging in living cells.