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Topic

Xanthene

About: Xanthene is a(n) research topic. Over the lifetime, 2132 publication(s) have been published within this topic receiving 34803 citation(s). The topic is also known as: Xanthene & dibenzo[a,e]pyran.


Papers
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Journal ArticleDOI
TL;DR: The dawn of old stars: Classic xanthene dyes like eosin Y (gr. eoς=goddess of dawn) and green-light irradiation can replace precious metal complexes for the organocatalytic asymmetric -alkylation of aldehydes rendering the process purely organic.
Abstract: The dawn of old stars: Classic xanthene dyes like eosin Y (gr eoς=goddess of dawn) and green-light irradiation can replace precious metal complexes for the organocatalytic asymmetric -alkylation of aldehydes rendering the process purely organic

531 citations

Journal Article
Abstract: The dawn of old stars: Classic xanthene dyes like eosin Y (gr. eoς=goddess of dawn) and green-light irradiation can replace precious metal complexes for the organocatalytic asymmetric -alkylation of aldehydes rendering the process purely organic.

504 citations

Journal ArticleDOI
Abstract: Fluorescence lifetimes of five representative xanthene dye species-the rhodamine B zwitterion (RB'), the rhodamine B cation (RB+), the rhodamine 66 cation (R6G+), the rhodamine 101 zwitterion (R101') and the fluorescein dianion (F2-)-were measured in HzO, D20 and in a series of alcohol solvents ranging from methanol to octanol The lietimes of both RB* and RB+ increased markedly as the solvent was varied from water to actanol In contrast, the lifetimes of R6G+ and R101' decreased slightly over the alcohol series and that of F2- increased only slightly in the same series For all the dyes studied the fluorescence lifetimes observed in DzO were slightly longer than those in H20 Possible causes for the variations observed are discussed

453 citations

Journal ArticleDOI
Abstract: The singlet oxygen quantum yield (ϕ1o2) of 11 purified fluorescein derivatives was determined by reaction with singlet oxygen acceptors in aqueous and ethanolic solutions; in both solvents ϕ1o2 was enhanced with increasing halogenation. Tryptophan and 2,2,6,6-tetramethylpiperidone were found to be unadapted for the determination of ϕ1o2, in our systems; however, the use of 9.10-dipropionic anthracene acid andp-nitrosodimethylaniline in conjunction with imidazole derivatives was suitable for 1O2 detection in water. Both methods lead to results in excellent agreement. As in ethanol. ϕ1o2, was equal to the triplet state quantum yield (ϕT), the comparison between the two solvents showed that ϕT in water was greater than in ethanol. The comparison between our values obtained with polychromatic light with published data obtained with monochromatic light suggests that the triplet quantum yield of fluorescein derivatives is wavelength independent.

377 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20222
202182
202091
201986
201891
2017107