We report here the synthesis of a new thio-aza macrocyclic chemosensor based on the 2,5-diphenyl[1,3,4]oxadiazole in which two thioether groups were inserted in a macrocycle with the aim to make it suitable for the coordination of soft and heavy metal ions. In acetonitrile soln., the fluorescence of the chemosensor changes upon addn. of different metal ions, such as Cu(II), Zn(II), Cd(II), Pb(II), Hg(II) and Ag(I), that form a not fluorescent ML species and a fluorescent M2L species characterized also via NMR expts. The hosting of the chemosensor inside the PluS Nanoparticles leads to a high water soly., allowing to perform the metal detection without the use of addnl. solvents and also induced an higher selectivity towards Ag(I) and Hg(II). Moreover, it was demonstrated for the first time the possibility to control the stoichiometry of the formed complex upon changing the no. of ligands per nanoparticles. To our opinion, this possibility can give an addnl. tool for the tuning of the affinity and selectivity of the chemosensor that could be of great interest for the design of more and more efficient systems.
PluS Nanoparticles as a tool to control the metal complex stoichiometry of a new thio-aza macrocyclic chemosensor for Ag(I) and Hg(II) in water
AMBROSI, GIANLUCA;BORGOGELLI, ELISA;FORMICA, MAURO;FUSI, VIERI
;GIORGI, LUCA;MICHELONI, MAURO SERGIO;
2015
Abstract
We report here the synthesis of a new thio-aza macrocyclic chemosensor based on the 2,5-diphenyl[1,3,4]oxadiazole in which two thioether groups were inserted in a macrocycle with the aim to make it suitable for the coordination of soft and heavy metal ions. In acetonitrile soln., the fluorescence of the chemosensor changes upon addn. of different metal ions, such as Cu(II), Zn(II), Cd(II), Pb(II), Hg(II) and Ag(I), that form a not fluorescent ML species and a fluorescent M2L species characterized also via NMR expts. The hosting of the chemosensor inside the PluS Nanoparticles leads to a high water soly., allowing to perform the metal detection without the use of addnl. solvents and also induced an higher selectivity towards Ag(I) and Hg(II). Moreover, it was demonstrated for the first time the possibility to control the stoichiometry of the formed complex upon changing the no. of ligands per nanoparticles. To our opinion, this possibility can give an addnl. tool for the tuning of the affinity and selectivity of the chemosensor that could be of great interest for the design of more and more efficient systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
