Luminescence Properties of Tris(2,2‘-bipyridine)ruthenium(II) in Sol−Gel Systems of SiO₂

Abstract

The luminescence spectra and the lifetime of tris(2,2′-bipyridine)ruthenium(II), Ru(bpy) 3 2+ , were studied in the sol-gel reaction system of tetramethoxysilane (TMOS) at room temperature. The luminescence peaks and lifetime were considerably altered by the nature of the sol-gel matrix. These findings are discussed in connection with adsorption of Ru-(bpy) 3 2+ on gels and lower temperature measurements at 77 K.

Luminescent Properties of Tris(2,2′-bipyridine)ruthenium(II) in Sol-Gel-Processed Dip-Coated Thin Films

“…This blue shift on the emission spectra of ruthenium(II) complexes has also been observed by other authors in similar systems (8,12,13).…”

“…The dynamic properties of the excited state of Ru(bpy) 2+ 3 and related complexes adsorbed on semiconductors are also widely studied (2)(3)(4). Apart from those on semiconductors, there is an important number of studies on Ru(bpy) 2+ 3 adsorbed on nonconducting materials such as SiO 2 , which can actually modify photochemical reactions (5)(6)(7)(8).…”

Temperature response of luminescent tris(bipyridine)ruthenium(II)-doped silica nanoparticles

“…This shift, which is characteristic of "rigidochromism" [24][25][26][27], indicates that the complex has indeed been entrapped into the SiO 2 matrix during the formation of the shell. Furthermore, the measured Stöber SiO 2 particles are by no means impenetrable spheres [32].…”

Mesostructured Silica Chemically Doped with RuII as a Superior Optical Oxygen Sensor

“…This is a common behavior for a luminophore doped in a wide variety of host matrixes. [16,24,38,40,58,59] When the Ru II complex is covalently grafted to the silicates network, the time-resolved intensity decay traces change from double exponential to single exponential, resulting in near single-exponential intensity decay curves and linear Stern-Volmer plots (as shown in Figs. 4 and 5).…”