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 article, the spectral data and chemical reactions of the lactone are compatible with the structure of the 2-Acyl-3-methyl-1,4-naphthoquinone-2,3-epoxide.
Abstract: 2-Acyl-3-methyl-1,4-naphthoquinone-2,3-epoxide(1) isomerizes photochemically to give lactone. The spectral data and chemical reactions of the lactone are compatible with structure(2). Photochemical reaction of (1) with xanthene was also described.
TL;DR: In this paper, the absorption and fluorescence of Eosin Y have been investigated in a series of alkanols (methanol to propanol) and the rate constants of quenching were calculated using the Stern-Volmer equation.
Abstract: Eosin Y belongs to a xanthene group. It is an anionic fluorescent dye. The absorbance and fluorescence of Eosin Y have been investigated in a series of alkanols (methanol to propanol). When the solvents are added to the aqueous solution of Eosin Y (EY) the absorbance and fluorescence intensity are enhanced. The alkanols are found to affect the absorption and fluorescence spectra of the dye. On the basis of solvent adsorption model the binding constants of the dye with alkanols have been estimated. The interaction of solvent molecule with dye in aqueous solution is specific in nature. The fluorescence quenching of Eosin Y by the inorganic ions [Fe(CN)6]−3, [Fe(CN)6]−4 and Cl− was also observed. The ions influenced the quenching process to different extents. The rate constants of quenching were calculated using the Stern-Volmer equation. The equilibrium constant of dye in presence of inorganic ions are determined by Scott equation.
Patent•
01 Apr 1987
TL;DR: In this article, the radical of an organic dyestuff of the mono- or poly-azo, metal complexazo, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone or nitroaryl series, W is a direct bond or a bridge member.
Abstract: of EP01256501. Reactive dyestuffs of the formula see diagramm : EP0125650,P52,F4 wherein D is the radical of an organic dyestuff of the mono- or poly-azo, metal complexazo, phthalocyanine, formazan, azomethine, dioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone or nitroaryl series, W is a direct bond or a bridge member, R is hydrogen or alkyl, A is a radical of the formula see diagramm : EP0125650,P52,F7 wherein X = hydrogen or chlorine and Z = CCl3 , CHCl2 or CH2 Cl, and n is 1 or 2.
TL;DR: In this article, the authors describe efficient, operationally simple, and high yielding procedures for the synthesis of dibenzo[a,i]xanthene-diones.
Abstract: Facile, operationally simple, and high yielding procedures for the synthesis of dibenzo[a,i]xanthene-diones are described.