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

Luminescence quenching of tris(2,2′-bipyridine)ruthenium(II) by 2,6-dimethylphenol and 4-bromo-2,6-dimethylphenol in sol–gel-processed silicate thin films

“…Similar spectroscopic results with tetraethoxysilane TEOS-derived films were obtained in our previous study with films prepared by the dip-coating procedure [17]. Then, both studies suggest that the blue emission spectral shift with respect to the aqueous solution (λ max = 609 nm) was Fig.…”

“…The decrease in the luminescence efficiency vs temperature increase may be attributed to the decrease in the lifetimes and to a probable increase in the quenching rate of the photoexcited Ru(bpy) 2+ 3 complex by oxygen. The oxygen quenching of luminescence of Ru(II) complexes sequestered in organically modified silicate thin films and the temperature effect on the oxygen quenching were already observed in previous studies [17,26,[28][29][30].…”

“…On the other hand, a very low K SV1 value was obtained in our previous work with MTMOS-derived dip-coated thin films, 240 M −1 ( Table 2 and Ref. [17]). All these Stern-Volmer constants are much lower than the value for 4-Br-2,6-DMP in water 2250 M −1 .…”

“…The luminescence decay profile was properly fitted by a sum of two exponentials in the standard biexponential method fitting model [17]. This method is named BM in this study.…”

Fluorescence properties of a ruthenium complex in silane sols and gels at different pH

“…During this dynamic process major changes occur in the nearest vicinity of the molecule, referring equally to the chemical nature, viscosity, polarity, and structure [15][16][17]. Interesting is the estimation of the types of interactions of molecule immobilized in the gel with microenvironment changing during the sol-gel transition, with special reference to the effect of proton solvents and also to the presence of hydroxyl groups formed while the gel net is created [18][19][20][21][22][23].…”