Two-photon excited fluorescence properties and anions recognition of a trivalent organoboron compound

A trivalent organoboron compound with diethylamino as an electron donor group and dimesitylboryl as an electron acceptor group has been synthesized. Its single- and two-photon excited fluorescence properties have been examined. Pumped by 820 nm laser pulses in femtosecond regime, it showed strong two-photon excited fluorescence at 527 nm in toluene with two-photon absorption cross-section being 859GM. The compound has been found to be a sensitive chemosensor for fluoride and cyanide anions in THF solutions.

► A D-π-A dipolar organoboron compound with long conjugated bridge was synthesized.
► The compound exhibits strong two-photon excited green fluorescence in toluene.
► The compound is a sensitive chemosensor for fluoride and cyanide anions in THF.