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.

Xanthene-9-carboxylates

Abstract: The invention relates to xanthene-9-carboxylates of the formula ##STR1## wherein R1 and R3 may be the same or different and represent a lower alkyl group, n and m each are integers of 2 to 5, or pharmaceutically-effective salts thereof The compounds according to the invention possess cholinolytic and bronchospasmolytic effects and are completely devoid of harmful side-effects Thus these compounds can be used to great advantage in therapy

Photocolorable vacuum sublimed xanthene dye

Abstract: AN OPTICAL RECORDING AND STORAGE MEDIA COMPRISES A SUBSTRATE HAVING AN ESSENTIALLY COLORLESS VACCUM SUBLIMED XANTHENE DYE TYPE FILM THEREON. THE XANTHENE DYE IS OF THE TYPE HAVING A PENDANT PHENYL RING AT THE 9TH CARBON OF THE XANTHENE STRUCTURE. A COOH GROUP IS PRESENT ON THE CARBON ATOM OF THE PHENYL RING IMMEDIATELY ADJACENT THE LINKING CARBON OF THE RING. ELECTRON WITHDRAWING GROUPS ARE PRESENT ON THE XANTHENE STRUCTURE. AN EXAMPLE OF SUCH A MATERIAL IS RHODAMINE B.

Blue-ray doped material and preparation method and application thereof

Abstract: The invention discloses a blue-ray doped material and a preparation method and application thereof, and belongs to the technical field of an organic optoelectronic material. The blue-ray doped material has a molecular structure as shown in a formula 1: (with reference to the specification), wherein X is oxygen or sulphur or does not exist; either of Ar1 and Ar2 respectively is one of an aryl group with a carbon atom number of 6 to 20, a condensed aromatic group with a carbon atom number of 10 to 20 and an aromatic heterocyclic group which contains at least one of a nitrogen atom, an oxygen atom and a sulphur atom and has a carbon atom number of 4 to 20. According to the blue-ray doped material disclosed by the invention, i.e. the compound as shown in the formula 1, due to existence of a spiro group and introduction of a triarylamine structure, carrier mobility and luminous efficiency of the blue-ray doped material are improved, and the optical-electrical characteristic of the blue-ray doped material is greatly improved; moreover, an xanthene group is used as a parent nucleus, so that the compound product has an excellent luminescent property. The blue-ray doped material has the luminescent property, is good in film forming property and has high stability at the room temperature.

New soluble cyano‐containing poly(arylene ether) copolymers bearing pendant xanthene groups

Abstract: Homopolymers and copolymers of poly(arylene ether nitrile) (PAEN)-bearing pendant xanthene groups were prepared by the nucleophilic substitution reaction of 2,6-difluorobenzonitrile with 9,9-bis(4-hydroxyphenyl)xanthene (BHPX) and with various molar proportions of BHPX to hydroquinone (100/0 to 40/60) with N-methyl-2-pyrrolidone (NMP) as a solvent in the presence of anhydrous potassium carbonate. These polymers had inherent viscosities between 0.61 and 1.08 dL/g, and their weight-average molecular weights and number-average molecular weights were in the ranges 34,200–40,800 and 17,800–20,200, respectively. All of the PAENs were amorphous and were soluble in dipolar aprotic solvents, including NMP, N,N-dimethylformamide, and N,N-dimethylacetamide and even in tetrahydrofuran and chloroform at room temperature. The resulting polymers showed glass-transition temperatures (Tg's) between 220 and 257°C, and the Tg values of the copolymers were found to increase with increasing BHPX unit content in the polymer. Thermogravimetric studies showed that all of the polymers were stable up to 422°C with 10% weight loss temperatures ranging from 467 to 483°C and char yields of 54–64% at 700°C in nitrogen. All of the new PAENs could be cast into transparent, strong, and flexible films with tensile strengths of 106–123 MPa, elongations at break of 13–17%, and tensile moduli of 3.2–3.7 GPa. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011