دانلود مقاله با موضوع تشخیص روشن-خاموش رنگ سنجی و فلورسنت Cu2+، Sn2+ و Zn2+
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موضوع به انگلیسی:Colorimetric and fluorescent on-off detection of Cu2+, Sn2+ and Zn2+ by
a water-soluble porphyrin
بخشی از متن:The strong light absorption behavior and high emission property of porphyrins and their derivatives permit the
potential detection of various transitionmetal ions through binding to the porphyrin core. Here inwe report the
colorimetric and fluorescent enhancement and fluorescent turn-off detection of Sn2+, Zn2+ and Cu2+ by using a
simple water-soluble porphyrin (TPPS) as molecular sensor. The porphyrin sensor displayed different electronic
absorption pattern, fluorescent emission behavior and color change up on interactingwith Sn2+, Zn2+ and Cu2+
in aqueous solution at room temperature. Interestingly, TPPS showed higher selectivity toward Cu2+ than Sn2+
and Zn2+ ions. Treating aqueous solution of TPPSwith amixture of Sn2+ and Zn2+ ions showed better selectivity
for Sn2+ than Zn2+ ion. On the other hand, the electronic absorption pattern and emission behavior of TPPS
showed no change at all up on addition of aqueous solution of the rest cations under study (Co2+, Ca2+, Na+,
Ag+, Mn2+, Pb2+, Fe3+, Cd2+, Ni2+, NH4
+). This may be attributed to unique electronic behavior of the metal
ion and ionic radius. The study shows the possibility ofmolecular based selective metal ion detection in aqueous
solution. The selectivity and fluorescence on-off detectionmay be attributed to the size ofmetal ions to easily incorporate
into porphyrin core, paramagnetic nature ofmetal ions, conformational rigidity after complexation and
inhibition of PET (Photoinduced Electron Transfer) quenching pathways. The study has been successfully applied
to effective detection of metal ion from discharged tannery effluent collected from Bahir Dar Tannery before
treatment
