A novel fluorescein-porphyrinatozinc(II) hybrid, Zn(Fl-PPTPP), was synthesized and characterized by u.v.-vis., i.r., 1 H-n.m.r, ESMS and elemental analyses. The supramolecular self-assembly of Zn(Fl-PPTPP) with an imidazolyl-linked porphyrinatomanganese(III), Mn (III) ( p-ImBPTPP)Cl, complex has been studied by fluorescence spectroscopic titration, VPO measurements and ESMS, which indicates that the formation of the Zn(Fl-PPTPP)-Mn (III) ( p-ImBPTPP)Cl. supramolecular complex is driven by coordinative bonding formed by the coordination of imidazolyl group in Mn (III) ( p-ImBPTPP)Cl to Zn(II) in Zn(Fl-PPTPP). The association constant of the supramolecular complex was calculated from the fluorescence spectroscopic titration data. It was found that the conformation of the Zn(Fl-PPTPP)-Mn (III) ( p-ImBPTPP)Cl supramolecular complex, the steric hindrance and the electronic effect of the fluorescein group linked to porphyrin through a flexible long alkoxy chain are all acting on the association constant of the Zn(Fl-PPTPP)-Mn (III) ( p-ImBPTPP)Cl supramolecular complex. It seems that the steric hindrance and the electronic effect of the fluorescein group are the primary factors effecting the association constant of Zn(Fl-PPTPP)-Mn (III)
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