Novel D-π-A-π-D structural 2, 2′-bipyridine derivatives with different electron donors: Structure, one- and two-photon excited fluorescence and bioimaging

Two novel D-π-A-π-D structural dyes were prepared. The dyes exhibit superior one- and two-photon excited fluorescence with high fluorescence quantum yield and large two-photon absorption cross-section values. Results of cell imaging experiments show the values of them in fluorescence microscopy bioimaging applications.276