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Interplay of Anion-π+ and π+-π+ Interactions ….. Applications in Live Cell Mitochondrial Imaging.

Recently, the concept of anion- π + interactions has witnessed unique applications in the field of AIEgen development. In this contribution, we disclose a consolidated study of a library of N-doped ionic AIEgens accessed through silver-mediated cyclization of pyridino-alkynes. A thorough photophysical, computational and crystallographic study has been conducted to rationalize the observed substituent- and counterion-dependant fluorescence properties of these luminogens. We further elucidate the prominent role of anion- π + interactions, π + - π + interactions and other non-covalent interactions, in inhibiting the undesired ACQ effect. Finally, we have also demonstrated the application of selected AIEgens for imaging of mitochondria in live cells.