Topic
Xanthene
About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.
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TL;DR: In this paper, three new imidazole-derived moiety/spiro[fluorene-9,9′-xanthene] hybrid compounds were synthesized for highly efficient blue light-emitting devices.
4 citations
Patent•
04 Feb 2015
TL;DR: In this article, a xanthene fluorescence dye is designed and synthesized, the dye has the double-spiro six-membered ring fused system, the optical signal release of the dye is controlled by the double spiro structure, the opening/closing of the spiro structures regulates the fluorophore xanthen conjugation system (the quinone type system forms or disappears) in the whole molecular structure, and the absorption wavelength and the emission wavelength are expanded so as to make the optical signals intensity accordingly change.
Abstract: The invention relates to a xanthene fluorescence dye, a preparation method and applications thereof, wherein the fluorescence dye is 3',3''-bis(oxospiroisobenzofuran)-3-hydroxy-7-(diethylamino)benzopyran-xanthene. According to the present invention, the xanthene fluorescence dye is designed and synthesized, the dye has the double-spiro six-membered ring fused system, the optical signal release of the dye is controlled by the double-spiro structure, the opening/closing of the spiro structure regulates the fluorophore xanthene conjugation system (the quinone type system forms or disappears) in the whole molecular structure, and the absorption wavelength and the emission wavelength are expanded so as to make the optical signal intensity accordingly change; and the isothiocyanate derivative molecule fluorescence probe synthesized through further derivatization provides characteristics of rapid response, high selectivity, high detection sensitivity and low detection limitation on Hg . In summary, the present invention provides the xanthene fluorescence dye design synthesis method, and the dye is adopted to design the Hg detecting molecule fluorescence probe for the optical signal report gene.
4 citations
TL;DR: It is suggested that the excited species, apparently triplet carbonyls and 1O2, are formed from the biomolecular decay of the peroxyl radicals via the Russell mechanism.
4 citations
TL;DR: In this article, a new holographic photopolymer material was developed, which is sensitized by dyes of xanthene and thioxanthene series which contain iodine and bromine heavy atoms.
Abstract: A new holographic photopolymer material is developed. The photopolymer material is sensitized by dyes of xanthene and thioxanthene series which contain iodine and bromine heavy atoms. Holographic recording was carried out during excitation of forbidden singlet–triplet electron transitions of dyes. Thioerythrosin triethylammonium was identified as the most effective sensitizer among a number of tested dyes. The spectral absorption area of the singlet–triplet electronic transition of the dye is conveyed in the red spectral range from 600 to 700 nm. The sensitivity of the photopolymer material to radiation with 633 nm wavelength is 180 mJ cm−2. Optimization of concentration of the main components of the photopolymer compositions was carried out in order to achieve maximum efficiency of holographic recording.
4 citations
TL;DR: In this article, the incorporation mechanisms of fluorescent xanthene dyes in 30-40nm silica nanoparticles were systematically studied, and it was shown that coverage of silica particles with hydrophobic protection layers of alkyltrialkoxysilanes or hydrophilic polyethylene glycol (PEG) groups resulted in better retention of physisorbed dyes.
Abstract: Silica nanoparticles with embedded fluorescent dyes represent an important class of markers for example in biological imaging. We systematically studied the various incorporation mechanisms of fluorescent xanthene dyes in 30–40 nm silica nanoparticles. An important parameter was the interaction of the dye with the matrix material, either by weak electrostatic or strong covalent interactions, which also has implications on the stability of fluorescence and brightness of the dyes. Factors that can influence leaching of dyes such as the position of the dyes in particles and the intensity of the particle-dye interaction were investigated by using the solvatochromic effect of xanthene dyes and by stationary fluorescence anisotropy measurements. We compared uranine and rhodamine B, which were physically embedded, with modified fluorescein isothiocyanate and rhodamine B isothiocyanate, which were covalently bound to the silica matrix within a usual Stober synthesis. Systematic leaching studies of time spans up to 4 days revealed that covalent bonding of dyes like fluorescein isothiocyanate or rhodamine B isothiocyanate is necessary for fluorescence stability, since dyes bound by physical interaction tend to leach out of porous silica networks. Coverage of silica particles with hydrophobic protection layers of alkyltrialkoxysilanes or hydrophilic polyethylene glycol (PEG) groups resulted in a better retention of physisorbed dyes and provides the possibility to adapt the particles to the polarity of the medium. Best results were archived with PEG groups, but even small trimethylsilyl (TMS) groups already reduce leaching.
4 citations