A New 3,5-Bisporphyrinylpyridine Derivative as a Fluorescent Ratiometric Probe for Zinc Ions

authors	Moura, NMM; Nunez, C; Santos, SM; Faustino, MAF; Cavaleiro, JAS; Paz, FAA; Neves, MGPMS; Capelo, JL; Lodeiro, C
nationality	International
journal	CHEMISTRY-A EUROPEAN JOURNAL
author keywords	fluorescent probes; porphyrinoids; sensors; X-ray diffraction; zinc
keywords	BETA-CONDENSATION REACTIONS; SUPPORTED DEVICES; HIGH SELECTIVITY; FORCE-FIELD; MERCURY; CHEMOSENSORS; RECOGNITION; SENSOR; LUMINESCENCE; POLYAMINES
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.
publisher	WILEY-V C H VERLAG GMBH
issn	0947-6539
year published	2014
volume	20
issue	22
beginning page	6684
ending page	6692
digital object identifier (doi)	10.1002/chem.201402270
web of science category	Chemistry, Multidisciplinary
subject category	Chemistry
unique article identifier	WOS:000336002200019
link	24782336