Experimental and theoretical spectral properties of ethyl 2-(7-hydroxy-2-oxo-2H-chromen-4-yl)acetate doped sol-gel materials: new materials with potential optical application

Preparation and optical properties of samarium doped sol–gel materials

“…4 The samples were analyzed by X-ray diffraction, using a standard powder diffractometer. 5 The chemical composition and the thermogravimetrical (TG) behavior of the xerogels were checked by TG/FTIR measurements. 6,7 The sample to be investigated was transferred into a crucible that was made from aluminum or platinum.…”

“…Moreover, transparent gels containing high rare-earth content are good candidates for optical filters as thin films or monoliths. On the other hand, the preparation of transparent monoliths, containing Sm(III)-coumarin complexes [Sm(K4) 2 3 was demonstrated [5,6]. Here, K4 and K2 are different coumarin molecules, K4 is ethyl 2-(7-hydroxy-2-oxo-2H-chromen-4-yl)acetate and K2 is 3-(3-(4-(dimethylamino)phenyl)propenoyl)-2H-chromen-2-one.…”

Optical properties of sol-gel materials doped with ethyl 2-(7-hydroxy-2-oxo-2H-chromen-4-yl) acetate

“…The preparation of K4 doped silica gels follows our recently described sol-gel procedure [7,8]. Tetraethoxysilane (TEOS) (98 %) and absolute EtOH (99.8 %) are mixed together in a 1:1 molar ratio.…”

“…Some questions concerning the change of optical spectra due to the gel formation, the chemical composition, thermal stability of coumarin doped gels, however, remained open. This paper is a continuation of our recent studies of embedded organic molecules in gel glasses, using sol-gel technology [7,8]. Now we describe in details the optical properties of silica gels and ethanol solutions doped with K4 using UV/Vis, excitation and luminescence spectroscopy in order to understand the luminescence/excitation properties of such materials and to use the optical spectra as a probe for coumarin incorporation in the gel structure.…”

“…Recently we described the preparation and characterization of SiO2 gels, doped with Sm(III) ions and 3-(3-(4-(dimethylamino)phenyl)propenoyl)-2H-chromen-2-one (K2) or ethyl 2-(7-hydroxy-2-oxo-2H-chromen-4-yl)acetate (K4) for a first time [7,8]. We demonstrated that the Sm(III) ions form complexes [Sm(K4)2(H2O)4]x(NO3)3 or [Sm(K2)2(H2O)2]x(NO3)3 in the gels containing K2 or K4.…”