TY - JOUR AU - Dobkowski, Jacek AU - Wnuk, Pawel AU - Buczynska, Joanna AU - Pszona, Maria AU - Orzanowska, Grazyna AU - Frath, Denis AU - Ulrich, Gilles AU - Massue, Julien AU - Mosquera-Vázquez, Sandra AU - Vauthey, Eric AU - Radzewicz, Czeslaw AU - Ziessel, Raymond AU - Waluk, Jacek TI - Substituent and Solvent Effects on the Excited State Deactivation Channels in Anils and Boranils PY - 2015 JF - Chemistry - A European Journal JA - Chem. - Eur. J. SN - 0947-6539 VL - 21 IS - 3 SP - 1312 EP - 1327 L1 - http://onlinelibrary.wiley.com/doi/10.1002/chem.201404669/pdf L2 - http://onlinelibrary.wiley.com/enhanced/doi/10.1002/chem.201404669 L3 - http://doi.wiley.com/10.1002/chem.201404669 L4 - http://www.unige.ch/sciences/chifi/publis/pics/double/ref01447.png M3 - 10.1002/chem.201404669 UR - http://dx.doi.org/10.1002/chem.201404669 KW - anils KW - boranils KW - photochemistry KW - photophysics KW - ultrafast spectroscopy N2 - Differently substituted anils (Schiff bases) and their boranil counterparts lacking the proton-transfer functionality have been studied using stationary and femtosecond time-resolved absorption, fluorescence, and IR techniques, combined with quantum mechanical modelling. Dual fluorescence observed in anils was attributed to excited state intramolecular proton transfer. The rate of this process varies upon changing solvent polarity. In the nitro-substituted anil, proton translocation is accompanied by intramolecular electron transfer coupled with twisting of the nitrophenyl group. The same type of structure is responsible for the emission of the corresponding boranil. A general model was proposed to explain different photophysical responses to different substitution patterns in anils and boranils. It is based on the analysis of changes in the lengths of CN and CC bonds linking the phenyl moieties. The model allows predicting the contributions of different channels that involve torsional dynamics to excited state depopulation. ID - 1447 ER -