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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Patent•
13 Nov 2018
TL;DR: In this paper, a cuprous complex orange phosphorescence material with crystal form based on diphosphine ligand and 3-(2-benzoxazole) pyridine ligand was presented.
Abstract: The invention discloses a cuprous complex orange phosphorescence material with crystal form based on diphosphine ligand and 3-(2-benzoxazole) pyridine ligand and a preparation method thereof. A phosphorescence complex is obtained by complexing cuprous salt and ligand, and the molecular structure of the phosphorescence material is shown as [Cu(Xantphos)(3-PBO)2](PF6), wherein Xantphos is electrically neutral diphosphine ligand 4, 5'-double diphenylphosphine-9, 9'-double dimethyl xanthene, and 3-PBO is heterocyclic ligand 3-(2-benzoxazole) pyridine. The complex has the advantages that micromolecules are easy for purification and luminescence efficiency is high and has high thermostability. The material is obtained through direct mixing reaction of Cu(CH3CN)4PF6 and a dichloromethane solutionof the ligand, thereby having the advantages of simple and convenient process, simple equipment, easy-to-get raw materials and low cost. The material can serve as a photoluminescence orange yellow phosphorescence material and can be used as a luminescent layer phosphorescence layer in an electroluminescence device composed of multiple layers of organic materials.
TL;DR: Pentacyclic pyrrolo-and pyrido[1,2-a]xanthene[ 1,9-de]azepines were synthesized in various oxidation states by assembling the azepine ring following two strategies: 7-endo-trig cyclization of the aryl radical derived from a γ-methylene lactam and cyclodehydration of aldehydes.
Abstract: Pentacyclic pyrrolo- and pyrido[1,2-a]xanthene[1,9-de]azepines were synthesized in various oxidation states by assembling the azepine ring following two strategies: 7-endo-trig cyclization of the aryl radical derived from a γ-methylene lactam and cyclodehydration of aldehydes. Other strategies examined (Heck reaction and intramolecular acylation) did not afford azepines, but six-membered nitrogenated rings.
TL;DR: In this paper, the synthesis of p-condensed xanthenes (III) is achieved by iodine catalyzed condensation of dialdehydes (I) with naphthols (II) in the presence of I2.
Abstract: The synthesis of p-condensed xanthenes (III) is achieved by iodine catalyzed condensation of dialdehydes (I) with naphthols (II) in the presence of I2.
TL;DR: It was kinetically demonstrated that the structurally rigid conjugation of the xanthene moiety is an effective molecular design for the drastic enhancement of fluorescence emission efficiency.
Abstract: We have found that the spiro form of aminobenzopyranoxanthene (ABPX) exhibits dual solvatochromic and nanoaggregate fluorescence in organic solvents by spectrophotometric and theoretical analyses. The dual fluorescence properties of ABPX were adjustable in response to water content, and served as a new detection principal for naked-eye visualization (above 0.5 wt%) and quantification (0.010-0.125 wt%) of water in tetrahydrofuran. In investigating the optical properties of a dicationic form of ABPX, ABPX containing linear n-alkyl chains at amino groups were then synthesized. These ABPX exhibited fluorescence emission in the far-red and NIR wavelength regions, and we noted an increased fluorescence quantum efficiency with increasing n-alkyl chain length. To further improve the fluorescence quantum yields, we have designed and synthesized ABPX with different nitrogen-containing fused rings. It was kinetically demonstrated that the structurally rigid conjugation of the xanthene moiety is an effective molecular design for the drastic enhancement of fluorescence emission efficiency.
Patent•
09 Apr 2020
TL;DR: In this paper, the first monomer constitutes at least a portion of the structural units of the main chain of the fluorescent polymer and is crosslinked by a crosslinking agent.
Abstract: Provided is a novel fluorescent polymer that can be in the form of fluorescent fine particles or the like. A fluorescent polymer having structural units derived from a first monomer and structural units derived from a crosslinking agent, wherein the first monomer is a polycyclic fluorescent compound having two or more hydroxy groups, and is one or more species selected from the group consisting of anthracene derivatives, fluorene derivatives, pyrene derivatives, anthraquinone derivatives, porphyrin derivatives, binaphthalene derivatives, bipyridine derivatives, biphenyl derivatives, bisphenol derivatives, xanthene derivatives, dibenzofuran derivatives, and naphthalene derivatives, and the first monomer constitutes at least a portion of the structural units of the main chain of the fluorescent polymer and is crosslinked by a crosslinking agent.