A pyridine and pyrrole coupled rhodamine derivative for Co(II) ion detection and its imaging application in plant tissues

Abstract A rhodamine derivative ( 3 ) incorporating 2-[(1 H -pyrrol-2-ylmethyl)-(2-pyridinylmethyl) amino]- tripodal receptor in its architecture exhibited both fluorogenic and chromogenic signalling responses preferentially in presence of Co(II) ion. The observed absorption and fluorescence spectral enhancements along with a colour change in 3 on addition of Co(II) ion is associated with its complexation mediated structural transformation from spirolactam conformation to ring-opened amide derivative. The associated photophysical spectral modulations with Co(II) specificity, higher association constant corresponding to effective complexation, faster metal-probe kinetics, reversibility in ‘on-off’ signalling and a wider operation pH range endorses potential utility of 3 as chemosensing probe in practical applications such as detection of Co(II) ion uptake and accumulation in root and shoot tissues of Hybanthus enneaspermus plant species.

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