title: Corrole and corrole functionalized silica nanoparticles as new metal ion chemosensors: a case of silver satellite nanoparticles formation.
abstract: Corrole macrocycles are very appealing dyes for incorporation into light harvesting devices. This work shows the sensorial ability of 5,10,15-tris(pentafluorophenyl)corrole 1 and its monoanionic species toward Na(+), Ca(2+), Cu(2+), Cd(2+), Pb(2+), Hg(2+), Ag(+), and Al(3+) metal ions in toluene and acetonitrile. The photophysical studies toward metal ions were carried out by absorption and emission spectroscopy. From all metal ions studied, corrole 1 shows to be colorimetric for Hg(2+) allowing a naked-eye detection of Hg(2+) through a change of color from purple to blue in acetonitrile and from green to yellow in toluene. In addition a new β-imine corrole 4 was successful synthesized and further functionalized with 3-isocyanatopropyl-trimethoxysilane resulting in an alkoxysilane derivative 5. The grafting of alkoxysilane derivative 5 with optically transparent silica nanoparticles (SiNPs) was achieved succesfully. The new-coated silica nanoparticles with corrole 5 were studied in the presence of Cu(2+), Hg(2+), and Ag(+) as metal ion probes. Interestingly, upon addition of Ag(+), groups of satellite AgNPs were formed around the SiNPs and were checked by transmission electron microscopy (TEM). At same time, a change of color from green to yellow was observed.
authors.affiliation: Chemistry Department and QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Carla I M
authors.initials: CI
authors.lastname: Santos
authors.forename: Elisabete
authors.initials: E
authors.lastname: Oliveira
authors.forename: Javier
authors.initials: J
authors.lastname: Fernández-Lodeiro
authors.forename: Joana F B
authors.initials: JF
authors.lastname: Barata
authors.forename: Sérgio M
authors.initials: SM
authors.lastname: Santos
authors.forename: M Amparo F
authors.initials: MA
authors.lastname: Faustino
authors.forename: José A S
authors.initials: JA
authors.lastname: Cavaleiro
authors.forename: M Graça P M S
authors.initials: MG
authors.lastname: Neves
authors.forename: Carlos
authors.initials: C
authors.lastname: Lodeiro
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003300:Copper / Q000032:analysis / Q000737:chemistry; D008628:Mercury / Q000032:analysis / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000032:analysis* / Q000737:chemistry*; D013053:Spectrophotometry
chemical_list: D011166:Porphyrins; C431863:corrole; D012834:Silver; D012822:Silicon Dioxide; D003300:Copper; D008628:Mercury