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: The visible and ultraviolet absorption spectra, together with the excitation and fluorescence spectra of the chromatographically pure samples of rhodamines B, rhodamine 6G and violamine R are reported.
Abstract: Rhodamines, commonly used in microscopic studies, are basic dyes derived from xanthene. They have recently been used for the quantitative analysis of important cations, as well as in the vital staining of mitochondria of normal or pathological cells and also in the routine staining procedures. These applications may require a knowledge of the spectral behaviour of rhodamines. Here we report the visible and ultraviolet absorption spectra, together with the excitation and fluorescence spectra of the chromatographically pure samples of rhodamine B, rhodamine 6G and violamine R.
2 citations
TL;DR: In this article, the dielectric β-relaxation of PMMA, related to the reorientation of the polar ester carbonyl side groups, exhibits a broad distribution in the relaxation times that remains unaffected by the presence of the dye molecules.
Abstract: The potentials of developing tunable lasers with the use of photostable dyes, incorporated at solid-state hosts of high optical quality, have attracted considerable scientific interest. A critical factor determining the optical response of the dye is related to the extend to which its intrinsic physical and chemical properties are maintained in the environment provided. The thermally stimulated depolarization (TSD) current technique has been employed in order to investigate possible interactions between the typical thermoplastic carrier PMMA and dispersed xanthene and perylene derivatives. The dielectric β-relaxation of PMMA, related to the (re)orientation of the polar ester carbonyl side groups, exhibits a broad distribution in the relaxation times that remains unaffected by the presence of the dye molecules. The result is supportive of the model considering the chromophores being encapsulated in the polymer without strong (chemical) bonding, in agreement with the observed laser behavior. Further aspects of the dielectric response are discussed in terms of the specific sample preparation procedures and structural relaxation phenomena occurring in PMMA.
2 citations
TL;DR: In this paper, a facile, clean, green, efficient, and environmentally friendly protocol for the synthesis of the title compounds (III), (V), (VI), and (VIII) is presented.
Abstract: A facile, clean, green, efficient, and environmentally friendly protocol for the synthesis of the title compounds (III), (V), (VI), and (VIII) is presented.
2 citations
TL;DR: In this paper, the interactions of some organic dyes used as spectrophotometric reagents (triphenylmethane and xanthene dyes, azo dyes and thiazine dyes) with surfactants, and their effects on the UV-VIS absorption spectra, acid-base equilibria and stability of reaction products were studied.
Abstract: In this paper we studied the interactions of some organic dyes used as spectrophotometric reagents (triphenylmethane and xanthene dyes, azo dyes and thiazine dyes) with surfactants, and their effects on the UV-VIS absorption spectra, acid-base equilibria and stability of reaction products.
2 citations
TL;DR: In this article, the authors used thionyl chloride to give an intermediate 9,9-dichloroxanthene, which is free of further isolation and purification and can react with o-cresol or 2,6-dimethylphenol.
Abstract: Chlorination of xanthenone by thionyl chloride gave an intermediate 9,9-dichloroxantheneThe obtained chlorinated product is free of further isolation and purification and can react with o-cresol or 2,6-dimethylphenol for the preparation of two xthanenebiphenols including 9,9-bis(4-hydroxy-3-methylphenyl) xanthene and 9,9-bis(4-hydroxy-3,5-dimethylphenyl) xanthene with corresponding yields of 81% and 805%Their structures were characterized by elemental analysis,FTIR,1H NMR and 13C NMR spectraThe present method has advantages such as mild reaction conditions,convenient manipulation and good yield
2 citations