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We synthesized a series of donor-substituted tridurylboranes,and observed three excited states of these tridurylboranes: the locally excited (LE) state,the more planar ICT state and the more twisted ICT (TICT) state as compared to the ground state.The tridurylboranes reveal selective fluorescent response to fluoride,and the association constants are in range of 105–107M–1.