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•
29 Oct 2015
TL;DR: In this paper, a triphenylphosphine oxide unit bridged bipolar host material and an application thereof is presented, which has the spiro-[fluorene-9,9'-xanthene] group; properties of fluorene of wide energy gap and high luminous efficiency can be fully used.
Abstract: The present invention discloses a triphenylphosphine oxide unit bridged bipolar host material and an application thereof. Firstly, a spiro-[fluorene-9,9'-xanthene] structure is prepared by a cyclization reaction between 2-bromo-fluorenone and phenol, by two steps of Suzuki reaction, carbazole and spiro-[fluorene-9,9'-xanthene] is introduced on a triphenylphosphine oxide structure to obtain a target product SFOPO-Cz. According to the material disclosed by the present invention, the material has the spiro-[fluorene-9,9'-xanthene] group; properties of fluorene of wide energy gap and high luminous efficiency can be fully used; meanwhile, the carbazole group having good hole transporting property is adopted as a hole transport unit; the triphenylphosphine oxide group having strong electron transporting ability is adopted as an electron transport unit; so that implementation of carrier transporting balance is facilitated. A device which is designed and prepared by the material has the advantages of high efficiency, high stability and relatively small efficiency roll-off, and has excellent potential for being a new generation of an electroluminescent phosphor host material.
Patent•
18 Sep 2008
TL;DR: In this article, the xanthene derivative of formula (I) is new and independent claims are also included for: (1) the preparation of the xanthine derivative (I); (2) a xanthan conjugate obtained by reacting the xantha derivative with a biomolecule; and (3) a kit comprising the xathethan derivative and optionally at least one auxiliary material.
Abstract: Xanthene derivative (I) is new. Xanthene derivative of formula (I) is new. R 1-R 4A; A : alkyl or (hetero) aryl (both optionally substituted), alkoxy, cyano, hydroxy, halo, isocyanate, carboxy, sulfonyl or its derivative or H; R 5-R 10 : A, polyethylene or jeffamine; X : T; T : nucleofugal leaving group, which is sulfonate, sulfate, phosphate or phosphonate or biomolecule; and Y 1T, jeffamine, polyethylene or alcohol or amine (both optionally substituted). Independent claims are also included for: (1) the preparation of the xanthene derivative (I); (2) a xanthan conjugate obtained by reacting the xanthan derivative with a biomolecule; and (3) a kit comprising the xanthan derivative (I) and optionally at least one auxiliary material. [Image].
TL;DR: In this paper, a facile synthetic route utilizing readily available reagents affords a series of regioisomerically pure xanthene dye derivatives with relatively mild conditions and good to excellent yields.
Abstract: A facile synthetic route utilizing readily available reagents affords a series of regioisomerically pure xanthene dye derivatives. Advantages include relatively mild conditions and good to excellent yields. Nonpolar, highly crystalline intermediates are isolable by standard chromatographic techniques. The intermediates are in the requisite xanthene oxidation state, thus avoiding the need for relatively inefficient oxidation chemistry and/or harsh conditions. During the course of this work, a new boron-mediated 1,2-aryl migration reaction was discovered.
TL;DR: In this article , a number of bioactive azo dyes based on xanthene moiety were synthesized through an eco-friendly route using CuI-graphene nanocomposite as a sustainable reusable catalyst in ethanol aqueous solution at room temperature.
Patent•
23 Sep 1998
TL;DR: New dyes, their manufacture and their use, the new dyes conforming to the general formula (1) where Fb is the radical of a mono-, dis-, tris- or polyazo dye, of a 1:1 copper, 1:2 chromium or 1: 2 cobalt complex mono-,dis- or triasazo dye as mentioned in this paper.
Abstract: New dyes, their manufacture and their use, the new dyes conforming to the general formula (1) Where Fb is the radical of a mono-, dis-, tris- or polyazo dye, of a 1:1 copper, 1:2 chromium or 1:2 cobalt complex mono-, dis- or triasazo dye, of an anthraquinone, phthalocyanine, metal phthalocyanine, formazan, azomethine, dioxazine, triphendioxazine, phenazine, stilbene, triphenylmethane, xanthene, thioxanthone, nitroaryl, naphthoquinone, pyrenequinone or perylenetetracarbimide dye; B is each, independently of the other one, a direct covalent bond or a bridge member which is bonded to a ring carbon atom of an aromatic carbocyclic radical or to a ring carbon or nitrogen atom of an aromatic heterocyclic radical of Fb; R is each, independently of the other one, hydrogen or alkyl of 1 to 6 carbon atoms, unsubstituted or substituted; X is the 5,6-difluoropyrimidin-4-yl group; Z has the meaning of X or is another substituent which contains a heterocylic fiber-reactive radical; n is 1 to 2.