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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6 citations
TL;DR: It is found that tetrafluorination of the xanthene moiety in fluorescein derivatives can be a useful tool in the development of fluorescent probes.
Abstract: The synthesis and characterization of a 2',4',5',7' -tetrafluorinated derivative of fluorescein, called Aarhus Green, is reported. As with related 2 ',7'-difluorinated compounds, tetrafluorination of the xanthene-derived moiety ma kes the more fluorescent anion accessible over a larger pH range. However, in contrast to a p ublished report, we find that fluorination in the 4' and 5' positions does not appreciably decrea se the fluorescence quantum yield, φf. Rather, Aarhus Green has a reasonably large φf (0.79 ± 0.04). Moreover, Aarhus Green does not efficiently sensitize the production of singlet oxy gen and it is photostable. Thus, tetrafluorination of the xanthene moiety in fluorescein derivatives c an be a useful tool in the development of fluorescent probes.
6 citations
TL;DR: In this paper, the copper and cobalt substituted spinel ferrites have been synthesized by using hydrothermal method and the resultant spinels were systematically characterized by different techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR).
Abstract: Copper and cobalt substituted spinel ferrites Cu1-xCoxFe2O4 (0≤X≤1) have been synthesized by using hydrothermal method. The resultant spinel ferrites were systematically characterized by different techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FT-IR). It was indicated that all the resultant spinel ferrites obtained by the hydrothermal method had the single-phase crystalline. The resultant spinel ferrites were employed in the synthesis of 14-aryl-14-H-dibenzo[a,j]xanthene derivatives. It was found that the nanocatalyst Cu0.5Co0.5Fe2O4 displays the best performance in the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes. The catalyst was reused several times without significant loss of its activity for the preparation of desired product. In addition high yields of the products, solvent-free conditions and reusability of the catalyst are other worthwhile advantages of the present study.
6 citations
TL;DR: In this article, 12-aryl-12H-benzo[i][1,3]-dioxolo[4,5-b]xanthene-6,11-diones can be rapidly and efficiently synthesized in excellent yields by condensing a variety of aldehydes with 3,4methylenedioxyphenol and 2-hydroxy-1,4-naphthoquinone under solvent-free conditions.
6 citations