Fig. 1. The absorption (a) and two-photon (λ
ex = 760 nm) induced emission spectra (b) of TR-H2S (
), 2 (
), and 6 (
) at 25 °C in MeOH. Emission at around 500 nm is quenched (>97%) upon excitation of TR-H2S at 760 nm compared to excitation of 2 at 760 nm.
