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|Title:||A New 3,5-Bisporphyrinylpyridine Derivative as a Fluorescent Ratiometric Probe for Zinc Ions|
|Author:||Moura, Nuno M. M.|
Santos, Sergio M.
Faustino, M. Amparo F.
Cavaleiro, Jose A. S.
Almeida Paz, Filipe A.
Neves, M. Graca P. M. S.
Capelo, Jose Luis
|Publisher:||WILEY-V C H VERLAG GMBH|
|Abstract:||A new 3,5-disubstituted pyridine with two porphyrin moieties was prepared through an efficient synthetic approach involving 2-formyl-5,10,15,20-tetraphenylporphyrin (1), piperidine, and catalytic amounts of [La(OTf)(3)]. 3,5-Bis(5,10,15,20-tetraphenylporphyrin-2-ylmethyl)pyridine (2) was fully characterized and its sensing ability towards Zn2+, Cu2+, Hg2+, Cd2+, and Ag+ was evaluated in solution by absorption and fluorescence spectroscopy and in gas phase by using matrix-assisted laser desorption/ionization (MALDI)-TOF mass spectrometry. Strong changes in the ground and excited state were detected in the case of the soft metal ions Zn2+, Cd2+, Hg2+, and Cu2+. A three-metal-per-ligand molar ratio was obtained in all cases and a significant ratiometric behavior was observed in the presence of Zn2+ with the appearance of a new band at 608nm, which can be assigned to a metal-to-ligand charge transfer. The system was able to quantify 79ppb of Zn2+ and the theoretical calculations are in accordance with the stoichiometry observed in solution. The gas-phase sensorial ability of compound 2 towards all metal ions was confirmed by using MALDI-TOF MS and in solid state by using polymeric films of polymethylmethacrylate (PMMA) doped with ligand 2. The results showed that compound 2 can be analytically used to develop new colorimetric molecular devices that are able to discriminate between Hg2+ and Zn2+ in solid phase. The crystal structure of Zn-II complex of 3,5-bisporphyrinylpyridine was unequivocally elucidated by using single-crystal X-ray diffraction studies.|
|Appears in Collections:||CICECO - Artigos|
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|A New 35-Bisporphyrinylpyridine Derivative as a Fluorescent Ratiometric Probe for Zinc Ions_10.1002chem.201402270.pdf||1.69 MB||Adobe PDF|
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