title: Temperature response of luminescent tris(bipyridine)ruthenium(II)-doped silica nanoparticles.
abstract: Nanoparticle-based temperature imaging is an emerging field of advanced applications. Herein, the sensitivity of the phosphorescence of tris(bipyridine)ruthenium(II)-doped silica nanoparticles towards temperature is studied. 130 nm size particles were prepared by a modification of Stöber's method, that allows the incorporation of Ru[(bpy)(3)](2+) into the outer particle shell. The entrapped Ru[(bpy)(3)](2+) retains its photophysical properties, yet the emission of the particles is not affected by the presence of O(2), neither by anionic quenchers; quenching by MV(2+), on the other hand, is strongly dependent on pH. Between 20 and 60°C, the steady-state emission of the particles decreases linearly with increasing temperature. The slope of the straight line diminishes slightly on thermal cycling, but soon stabilizes. Fluorescence measurements by scanning confocal microscopy indicate that the silica nanoparticles doped with Ru[(bpy)(3)](2+) can indeed be employed to probe thermal processes in micro-environments.
authors.affiliation: Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, B1650KNA San Martín, Buenos Aires, Argentina; Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA Buenos Aires, Argentina.
authors.forename: Martín
authors.initials: M
authors.lastname: Mirenda
authors.affiliation: Laboratorio de Dinámica Intracelular, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA Buenos Aires, Argentina.
authors.forename: Valeria
authors.initials: V
authors.lastname: Levi
authors.affiliation: Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA Buenos Aires, Argentina.
authors.forename: Mariano Luis
authors.initials: ML
authors.lastname: Bossi
authors.affiliation: Grupo de Dinámica y Transporte Intracelular, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, C1428EHA Buenos Aires, Argentina.
authors.forename: Luciana
authors.initials: L
authors.lastname: Bruno
authors.affiliation: Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, B1650KNA San Martín, Buenos Aires, Argentina.
authors.forename: Andrea V
authors.initials: AV
authors.lastname: Bordoni
authors.affiliation: Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, B1650KNA San Martín, Buenos Aires, Argentina. Electronic address: regazzon@cnea.gov.ar.
authors.forename: Alberto E
authors.initials: AE
authors.lastname: Regazzoni
authors.affiliation: Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, B1650KNA San Martín, Buenos Aires, Argentina. Electronic address: wolosiuk@cnea.gov.ar.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Wolosiuk
mesh_terms: D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000737:chemistry; D056831:Coordination Complexes; D049449:Luminescence; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D017975:Ruthenium Compounds
chemical_list: D015082:2,2'-Dipyridyl; D056831:Coordination Complexes; D012822:Silicon Dioxide; C547232:tris(2,2-bipyridine)-ruthenium(II); D017975:Ruthenium Compounds