Excited-State Dynamics and Electron-Withdrawing Group Effects in Two-Photon Switchable Donor-Acceptor Stenhouse Adducts.

Non-linear optical reactive systems have important applications which require highly localized effects. Recently, we reported for the first time that donor-acceptor Stenhouse adducts (DASAs) have important two-photon switching properties. Here, we report on the nature of the non-linear excitation event and the resulting dynamics through femtosecond-resolved measurements.