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(a) Femtosecond transient absorption spectra of 1 in THF solution after excitation at 550 nm, the inset kinetic trace is probed at 461 nm. (b) Femtosecond transient absorption spectra of 2 in THF solution after excitation at 550 nm, the inset kinetic trace is probed at 474 nm. (c) Femtosecond transient absorption spectra of 3 in THF solution after excitation at 550 nm, the inset kinetic trace probed at 475 nm.
