10.1021/ic702388z.s001 Debdas Ray Debdas Ray P. K. Bharadwaj P. K. Bharadwaj A Coumarin-Derived Fluorescence Probe Selective for Magnesium American Chemical Society 2008 imine linkage coumarin derivatives Other metal ions emission metal ion 2008-04-07 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/A_Coumarin_Derived_Fluorescence_Probe_Selective_for_Magnesium/2946517 Two different coumarin derivatives have been connected via an imine linkage to obtain a new fluorescence signaling system. This compound itself does not show any emission due to rapid isomerization around the CN bond. However, in the presence of a Mg(II) ion, this isomerization is stopped because of bonding to the metal ion resulting in high-intensity (∼550-fold) emission. Other metal ions like Li(I), Ca(II), and Zn(II) show very little emission, while biologically relevant transition-metal ions do not show any emission. In this way, the Mg(II) ion can be detected in the presence of these ions.