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.

Synthesis of oligothiophene-layered polymers

Abstract: Polymers with layered π-electron systems comprising bithiophenes and quaterthiophenes based on a xanthene skeleton have been synthesized by an iron-catalyzed oxidative coupling reaction. The polymers are well soluble in common organic solvents, and polymer thin films are readily obtained by a spin-coating or casting technique. The synthesized polymers exhibit good thermal stability, and their 10% weight loss temperatures are approximately 400 °C. These behaviors of the polymers suggest that they can be used as opto-electronic devices such as hole-transporting materials.

New Class of Organic Hole-Transporting Materials Based on Xanthene Derivatives for Organic Electronic Applications

Abstract: In this work, we investigate the influence of three novel 14-aril-14H-dibenzo[a,j]xanthene derivatives (XDs) modified with different functional groups as very promising hole-transporting materials for organic optoelectronic devices Optical, electronic, and structural properties were analyzed by UV–vis absorption spectrum, cyclic voltammetry, and powder X-ray powder diffraction (XRPD) We investigated the influence of these XD as hole-transporting layers (HTL) on the performance of a simple stack bilayer OLED built with commercial aluminum tris(8-hydroxyquinoline) Alq3 acting as an electron-transporting and emissive layer (EML) As a proof-of-principle the XD devices were compared to reference devices fabricated with one of the most common hole-transporting materials, the N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)-2,2′-dimethylbenzidine (α-NPD) The structure of the devices was ITO/HTL (50 nm)/Alq3 (50 nm)/Al (120 nm) without encapsulation Under the same conditions, the devices using XD as HTL exhibited

The optical properties of 9-amino-9H-xanthene derivatives in different pH and their application for biomarkers in lysosome and mitochondria

Abstract: Two xanthene compounds attached with 4-pyridinylimino (2a) and 2-quinolinylimino (2b) were prepared. Their deprotonated-protonated equilibrium between pyridine/quinoline/ xanthene units and the corresponding pyridinum/quinolinium/xanthylium units were evaluated in different pH by absorption and emission spectra. Probes 2a-b gave the colorimetric changes and emission responses at 550–750 nm, and their pKas (2a: pKa1 = 4.53, pKa2 = 5.95; 2b: pKa1 = 2.33, pKa2 = 6.18) were calculated by emission spectra. To verify the protonation process of probes 2a-b, the other two xanthylene derivatives attached with pyridinium (3a) and quinolinium (3b) were designed and synthesized; they exhibited only the equilibrium between xanthene and xanthylium as expected. Probe 3a showed a ratiometric change at 525–750 nm, and probe 3b displayed an OFF–ON emission at 500–700 nm with the decrease of the solution acidity. The calculated pKas were 6.18 and 1.49, respectively. Moreover, the fluorescent imaging experiments indicated that probes 2a–b were lysosome biomarkers while probes 3a–b were mitochondrial biomarkers for HeLa cells.

Ceric-sulfate-catalyzed synthesis of 14-aryl-or 14-alkyl-14H-dibenzo[aj]xanthene under conventional heating and microwave irradiation

Abstract: A simple and facile procedure for the synthesis of 14-aryl- or 14-alkyl-14H-dibenzo[aj]xanthenes is described. The procedure takes place by the one-pot condensation of 2-naphthol with aldehydes in the presence of anhydrous ceric sulfate as the catalyst under solvent-free conventional heating and microwave irradiation.Key words: xanthene, one-pot condensation, aldehyde, 2-naphthol, ceric sulfate, solvent-free, microwave irradiation.