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Conclusion
With both types of metal ions: alkali and alkaline‐earth, meso‐
tetraphenylporphyrin can form charge transfer complexes in the
ground state, while in the excited state the modes of interaction
are totally different. With Mg2+ a mixed quenching of
fluorescence was observed, while with Na+ and K+ there was
enhancement of fluorescence intensity. Again, TP can efficiently
discriminate the two alkali metal ions through the extents of
enhancement for the same concentration of metal ions in
solution. Density functional theory (DFT)‐based calculation
could rationalize the sensing through electron density changes
explaining the inhibition of the PET mechanism.
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valuable suggestions and also for presenting the magnesium
perchlorate used in this work.
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