Hydrogen Bonding in the Electronic Excited State

Here, I will give a talk on our recent advances in electronic excited-state hydrogen-bonding dynamics and the significant role of excited-state hydrogen bonding on internal conversion (IC), electronic spectral shifts (ESS), photoinduced electron transfer (PET), fluorescence quenching (FQ), intramolecular charge transfer (ICT), and metal-to-ligand charge transfer (MLCT). The combination of various spectroscopic experiments with theoretical calculations has led to tremendous progress in excited-state hydrogen-bonding research. We first demonstrated that intermolecular hydrogen bond in excited state can be greatly strengthened or weakened for many chromophores. We have also clarified that intermolecular hydrogen-bond strengthening and weakening correspond to red-shifts and blue-shifts, respectively, in the electronic spectra. Moreover, radiationless deactivations (via IC, PET, ICT, MLCT, and so on) can be dramatically influenced by excited-state hydrogen bonding. References: [1] Guang-Jiu Zhao, and Ke-Li Han, \textit{Hydrogen Bonding in the Electronic Excited State, } \textit{Accounts of Chemical Research} \quad 45, 404--413 \quad (\textbf{2012}). http://pubs.acs.org/doi/pdf/10.1021/ar200135h [2] Book: \textit{Hydrogen Bonding and Transfer in the Excited State}, Editors: Ke-Li Han and Guang-Jiu Zhao, ISBN: 978-0-470-66677-7, \textit{John Wiley {\&} Sons Ltd}, Chichester, UK (\textbf{2011}). http://onlinelibrary.wiley.com/book/10.1002/9780470669143