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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the spectral distribution of the radiation-induced luminescence has been studied as a function of time and temperature giving information about the disposition and the fate of excitation energy produced by ionizing radiation.
3 citations
Journal Article•
3 citations
TL;DR: In this paper, thermally stable polyimide/titania (PI/TiO2) hybrid nanocomposite films have been successfully synthesized through the in situ formation of TiO2 within a PI matrix via sol-gel process.
Abstract: Thermally stable polyimide/titania (PI/TiO2) hybrid nanocomposite films have been successfully synthesized through the in situ formation of TiO2 within a PI matrix via sol-gel process. Poly(amic acid) (PAA) solution is prepared from 3,5-diamino benzoyl amino phenyl-14H-dibenzo[a,j]xanthene and 4,4′-(hexaflouroisopropylidene)diphthalic anhydride in N-methyl-2-pyrrolidinone solvent. The different amounts of tetraethyl orthotitanate and actylacetone are incorporated into PAA matrix, and then thermally imidized to form PI/TiO2. The chelating agent, acetylacetone, was applied to reduce the gelation rate of titanium alkoxide. Thermal decomposition temperatures of nanocomposites with a 10% weight loss were in excess of 500°C, and char yields higher than 63% at 800°C in nitrogen. The chemical and morphological structures of the hybrid nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and transmission electron microscopy. The results show that the TiO2 particles are well dispersed in the PI matrix with particle size between 10 and 30 nm in diameter. POLYM. COMPOS., 35:1486–1493, 2014. © 2013 Society of Plastics Engineers
3 citations
3 citations
TL;DR: In this paper, the synthesis of 9-aryl-1H-xanthene-1,8(2H)-dione derivatives starting from benzaldehydes or synthesized pyrazolcarbaldehyde and dimedone in the presence of 2,3,4,5,7,8,9,10-octahydropyrido[1,2-a]-[ 1,3]diazepin-1-ium acetate in high yields is reported.
Abstract: The synthesis of 9-aryl-1H-xanthene-1,8(2H)-dione derivatives starting from benzaldehydes or synthesized pyrazolcarbaldehydes and dimedone in the presence of 2,3,4,5,7,8,9,10-octahydropyrido[1,2-a]-[1,3]diazepin-1-ium acetate in high yields is reported The synthesis provides several advantages, including short reaction time, simple work-up, and environmental friendliness
3 citations