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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21 Jan 2003TL;DR: In this paper, a method for producing xanthene-carboxylic acid esters and the use of such esters as medicaments was described. But the method was not described.
Abstract: The invention relates to novel xanthene-carboxylic acid esters of general formula (1), in which X and the groups A, R, R1, R2, R3, R3', R4 and R4' are defined as per the claims and the description. The invention also relates to a method for producing said esters and to the use thereof as medicaments.
20 citations
TL;DR: Two-photon excitation spectra of xanthene dyes in ethanol were measured by observing fluorescence emission after excitation by light with wavelengths from 780 to 1260 nm as mentioned in this paper.
Abstract: Two-photon excitation spectra of xanthene dyes in ethanol were measured by observing fluorescence emission after excitation by light with wavelengths from 780 to 1260 nm. The normalized spectra showed large two-photon induced fluorescence at higher energies and two moderate peaks near the one-photon absorption band. These features agreed well with the two-photon excitation spectra reported by other authors. The peaks near the one-photon absorption band may be due to a two-photon allowed state overlapping the lowest singlet state or to excitation to the lowest singlet state. We believe the latter is the case; while a two-photon excitation is formally symmetry forbidden, both interaction with the counterion in solution as well as vibronic coupling will remove the symmetry, allowing this transition. Comparison of the spectra of dyes with slightly different structures supports this explanation. The input power dependence of fluorescence irradiance was also measured and some deviation from the expected quadratic dependence was observed in Rhodamine 6G and Rhodamine B.
20 citations
TL;DR: In this article, the structure of BOCTTX was deduced based on its correct elemental analysis and spectral data (IR, 1 H NMR, 13 C NMR and mass spectra).
20 citations
TL;DR: In this paper, a combination of steady-state and time-resolved radiolytic and photochemical methods was used to characterize the radical cations, radicals, and cations of interest of thioxanthyl and xanthyl.
Abstract: Radical cations generated from thioxanthene and xanthene undergo structural relaxation in low-temperature hydrocarbon glasses upon warming. Under conditions of unrestricted diffusion, deprotonation of the radical cations occurs and results in the formation of the thioxanthyl and xanthyl radicals. Subsequent electron loss leads ultimately to the closed-shell thioxanthyl and xanthyl cations. Using combined steady-state and time-resolved radiolytic and photochemical methods, the radical cations, radicals, and cations of interest were spectroscopically and kinetically characterized.
20 citations
TL;DR: The excited triplet quinoline undergoes a hydrogen abstraction reaction from xanthene in sodium dodecyl sulfate micellar solution The absorption intensity of a generated xanthenyl radical increases anomalously in the presence of magnetic fields as mentioned in this paper.
20 citations