Selective sensors for Zn2+ cations based on new green fluorescent poly(amidoamine) dendrimers peripherally modified with 1,8-naphthalimides.
The paper reports on the spectral photophysical characteristics of two new fluorescent PAMAM dendrimers of zero and second generation decoreted with 1,8-naphthalimide units, designed for ionic detection. The dendrimers were studied by (1)H NMR, (13)C NMR, FT-IR spectroscopy and elemental analysis. Their ability to detect ions has been evaluated in acetonitrile by monitoring the quenching of the fluoresence intensity. Different ions have been tested: Zn(2+), Co(2+), Ni(2+), Cu(2+) and Fe(3+) for the purpose. The results have shown clearly that only Zn(2+) could be efficiently detected using the dendrimer of second generation. In addition, it has been shown that for both dendrimers in a acetonitrile-water solution, the fluoresence intensity is pH dependant, hence could find application as a detector of harmful pH changes in the environment.
Sali
Seher
S
Institute of Polymers, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Grabchev
Ivo
I
Chovelon
Jean-Marc
JM
Ivanova
Galya
G
D002413:Cations, Divalent / Q000032:analysis; D050091:Dendrimers / Q000138:chemical synthesis / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D053644:Naphthalimides / Q000737:chemistry*; D010777:Photochemistry; D011073:Polyamines / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D015032:Zinc / Q000032:analysis*
D002413:Cations, Divalent; D050091:Dendrimers; D005456:Fluorescent Dyes; D053644:Naphthalimides; C104700:PAMAM Starburst; D011073:Polyamines; D015032:Zinc