Journal ArticleDOI
The nature of the silica cage as reflected by spectral changes and enhanced photostability of trapped Rhodamine 6G
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TLDR
Rhodamine 6G was embedded in a matrix of silica gel glass by the sol-to-gel technique as discussed by the authors, and its photostability and non-leachability were discussed in comparison with other solid environments, such as adsorption on powders and within porous glasses, thin films, and doping of plastic matrices.Abstract:
Rhodamine 6G was embedded in a matrix of silica gel glass by the sol to gel technique. The special features of an inorganic oxide glass as a carrier of an organic dye are discussed in comparison with other solid environments, such as adsorption on powders and within porous glasses, thin films, and doping of plastic matrices. Among the advantages mentioned are photostability of the glass matrix, trapping of the dye molecule, and its total isolation from undesired interactions with its neighboring dye molecules, impurities, and photodecomposition products; nonleachability of the dye; the ability to reach stable very high dye concentrations; reduction of translational, rotational, and vibrational degrees of freedom of the trapped dye; good transparency down to the UV. Embedding R6G in the silica glass enables one to reach high concentrations without undesirable dye aggregation. Stokes shift is larger in the glass than in water. Photostability of the dye is higher in the glass than in water. A remarkable front-face fluorescence stability is observed. These observations, and a critical review of the literature, are used to elucidate the nature of the silica glass cage: it is suggested that it is a hydroxylic polar environment, though somewhat less polar than water. The rigidity of the cage is discussed in terms of required reorientation of the environment around an excited state.read more
Citations
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Journal ArticleDOI
Luminescent properties of organic-inorganic hybrid monoliths containing rare-earth complexes
TL;DR: Transparent organic-inorganic hybrid monoliths containing rare-earth complexes (Eu(TTA)(3)Phen, Tb(Sal)(3)) were prepared via the sol-gel technique.
Journal ArticleDOI
Transition metal based hybrid organic-inorganic copolymers
TL;DR: In this paper, the synthesis of transition metal based hybrid copolymers is achieved by using transition metal alkoxides modified by chelating ligands functionalized with polymerizable organic groups.
Journal ArticleDOI
Dye leaching from a doped sol–gel is eliminated by conjugation to a dendrimer
TL;DR: The extent of leaching of dye molecules following encapsulation into sol-gel glasses was investigated in this article, where EITC was attached to a polyamidoamine generation 4 (PAMAM) dendrimer, having a molecular weight of 14,215 Da.
Book ChapterDOI
Organically Doped Sol-Gel Porous Glasses: Chemical Sensors, Enzymatic Sensors, Electrooptical Materials, Luminescent Materials and Photochromic Materials
TL;DR: The development of the method of trapping of organic molecules and enzymes in porous sol-gel matrices triggered the preparation and design of a wide range of novel optical materials, including chemical sensors, enzymatic sensors, electrooptical liquid crystal materials, luminescent materials and photochromic materials as mentioned in this paper.
Journal ArticleDOI
Probing the dynamic guest-host interactions in sol-gel films using single molecule spectroscopy.
TL;DR: The survival lifetimes for the majority of the tumbling and fixed molecules were found to be 4.3 and 13.1 s, demonstrating unequivocally that fixed molecules exhibit a higher photostability than tumbling molecules.
References
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Book
Advanced chemical methods for soil and clay minerals research : proceedings of the NATO Advanced Study Institute held at the University of Illinois, July 23 - August 4, 1979
J. W. Stucki,W. L. Banwart +1 more
TL;DR: In this article, the authors discuss the potential of the Mossbauer Effect and its application to Nuclei Other than Iron in the field of NMR and the application of ESR Spectroscopy to Inorganic-Clay.
Journal ArticleDOI
Advanced Chemical Methods for Soil and Clay Minerals Research
J. W. Stucki,W. L. Banwart +1 more
TL;DR: In this paper, the authors discuss the potential of the Mossbauer Effect and its application to Nuclei Other than Iron in the field of NMR and the application of ESR Spectroscopy to Inorganic-Clay.
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