Synthesis, characterization and fluorescence turn-on behavior of new porphyrin analogue: meta-benziporphodimethenes

• Switch-on/off fluorescent molecules
• Sensitive to zinc ions
• High quantum yields in porphyrinoid systems.
• Potential to use in cell imaging

New fluorescence switch-on meso-substituted free base meta-benziporphodimethenes were synthesized, characterized via acid catalyzed condensation reaction and metallated with Zn2 +. Their photophysical properties were also studied. The fluorescence spectra analysis demonstrates substituent's independent behaviour on emitting λmax. The average Stokes shift of 33 nm was observed. Crystal structure of 8 was obtained and gave expected perturbed geometry.

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