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.

Green catalysis preparation method for 14-aryl group-14 H-dibenzo [a, j] xanthene type derivative

Abstract: The invention discloses a green preparation method for 14-aryl group-14 H-dibenzo [a, j] xanthene type derivative and belongs to the technical field of chemical material preparation. According to the preparation method, in preparation reaction, the molar ratio of aromatic aldehyde to 2-naphthol is 1 to 2; the molar weight of the catalyst is 3-5 % of aromatic aldehyde; the reaction temperature is 110 DEG C; the reaction time is 10-30 min; the preparation method comprises the following steps: after reaction, water is added for cooling; a great amount of solid materials are precipitated; the solid materials are grinded and stand still and then are subjected to suction filtration; the obtained filter residues are water-washed and dried and then an aqueous solution with 95% of ethyl alcohol is adopted for recrystallization; the pure 14-aryl group-14 H-dibenzo [a, j] xanthene type derivative is obtained after vacuum drying. Compared with other preparation methods using acidic ionic liquid as the catalyst, the preparation method has the advantages that the catalyst activity is good, the losses in recycling are less, the biological degradation is easy to realize, the whole preparation process is simple, convenient and economic and the industrialized mass production is facilitated.

Organosoluble and transparent cardo polyimides with high Tg derived from 9,9-bis(4-aminophenyl)xanthene:

Abstract: 9,9-Bis(4-aminophenyl)xanthene (BAPX) was prepared simply and effectively via one-pot, two-step procedure using xanthenone and aniline as main substrates. The monomer BAPX was reacted with six arom...

A Fluorescent Sensor for Dinitrobenzoic Acid Based on a Cyanuric Acid and Xanthene Skeleton

Abstract: A new fluorescent sensor based on a dimethylxanthene skeleton has beensynthesized. Because of its oxyanion hole structure, this receptor includes a suitablecavity for the association of carboxylic acids. The receptor's fluorescence is quenchedupon addition of dinitrobenzoic acid.

Fluorene-terminated hole transporting materials with a spiro[fluorene-9,9′-xanthene] core for perovskite solar cells

Abstract: Three asymmetric spiro[fluorene-9,9′-xanthene] (SFX)-based hole transporting materials (HTMs) with N-(p-methoxyphenyl)-N′-(9,9′-dimethylfluoren-2-yl)amino (FPA) substituents, which are termed SFX-F, SFX-FM, and SFX-FP, have been synthesized by a facile process. When modifying the number and position of FPA substituents in the HTMs, it was found that there is no significant variation in the HOMO energy by increasing the number of FPA groups, while the thermal stability is governed by the substitution position. SFX-FM, which contains two meta-substituted FPA groups on the xanthene unit, exhibits a suitable HOMO energy level (−5.24 eV) and a strikingly high Tg (154 °C). In addition, SFX-FM also shows better film-forming properties and excellent hydrophobicity, which is conducive to fabricating high-performance devices. Noticeably, the PSCs based on SFX-FM achieved a power conversion efficiency (PCE) of 17.29% under AM 1.5 G illumination at 100 mW cm−2, unprecedentedly outperforming PSCs based on spiro-OMeTAD (15.14%).

3-Alkyl xanthene compounds

Abstract: The compounds of this invention are 3-alkyl xanthenes having pharmacological activity such as central nervous system activity. Preferred compounds of this invention are 3-(1,2-dimethylheptyl)-5,6,7,8-tetrahydro-1-hydroxy-9-methylxanthene, 3-(1,2-dimethylheptyl)-1-hydroxy-6,9-dimethylxanthene and 3-(1,2-dimethylheptyl)-1-hydroxy-9-methylxanthene.