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.

N‐(2‐Hydroxy­ethyl)‐13c‐meth­oxy‐1‐oxo‐1,13c‐dihydro­dibenzo[a,kl]xanthene‐2‐carboxamide

Abstract: The title compound, C24H19NO5, contains five fused rings, of which three are planar and the other two have twisted and flattened boat forms. The crystal structure is stabilized by intra- and inter­molecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds.

Xanthene-based dye, coloring composition containing the dye, coloring agent for color filter and color filter

Abstract: The present invention provides a xanthene-based dye which has a maximum absorbance wavelength of a solution on the UV and visible light absorption spectra in a long wavelength region of 560 nm or more, and which has excellent color characteristics (color gamut, brightness, contrast ratio, etc) and excellent heat resistance; a color composition comprising the compound; and a color filter comprising the color composition In particular, the xanthene-based dye is represented by general formula (1) In formula (1), R^1-R^4 are each independently -H, an alkyl group, and an aromatic hydrocarbon group; R^1 and R^2, or R^3 and R^4 may join to one another to form a ring with a single bond, a double bond, a substituted or unsubstituted methylene group, an oxygen atom, or a sulfur atom interposed therein; R^5 and R^6 each independently represent -H, a halogen atom, -NO_2, or an alkyl group; X represents -O-, -S-, or -Se-; Q represents a heterocyclic group; An represents an anion; a represents an integer of 1-3; and b represents an integer of 0-3 Formula (1) is neutral in terms of net electrical charge

3′,6′-Bis(diethyl­amino)-3H-spiro­[2-benzo­thio­phene-1,9′-xanthene]-3-thione

Abstract: The title compound, C28H30N2OS2, was obtained by thio­nation of 3′,6′-bis­(diethyl­amino)-3H-spiro­[isobenzofuran-1,9′-xan­thene]-3-one with 2,4-bis­(p-methoxy­phen­yl)-1,3-dithia­diphos­phetane disulfide (Lawesson's reagent). The planes of the two benzene rings of the xanthene system are inclined at a dihedral angle of 17.4 (1)°, and the plane of the dithio­phthalide group and the planes through the two benzene rings of the xanthene system make dihedral angles of 80.2 (1) and 82.8 (1)°, respectively.

Rigid non-cyclopentadienyl group 4 transition metal and rare earth metal catalysts for olefin polymerization

Abstract: The present application provides a catalyst component for alkene polymerization. The catalyst component contains: (a) a group 4 transition metal or rare earth metal, (b) a rigid non-cyclopentadienyl ligand with a tricyclic backbone composed of three ortho-fused 6-membered rings in a linear arrangement (as is the case in xanthene), with or without additional fused rings; the tricyclic backbone contains at least one donor atom within the central ring (as is the case for xanthene, oxanthrene, or acridan); furthermore, donor atoms/groups or aryl rings are attached directly (i.e. via the donor atom in the case of donor groups) to both of the bondable carbon atoms adjacent to at least one of the donor atoms within the central ring (e.g. xanthene with two donor groups, or two aryl rings, or one donor group and one aryl ring adjacent to oxygen), and (c) two or more activatable ligands, such as chloro, alkyl, aryl, allyl or hydride ligands, attached to the central metal if the complex is neutral or anionic, or one or more activatable ligand if the complex is monocationic or dicationic. The rigid non-cyclopentadienyl ligand has a charge of 0, 1- or 2- (considering all donor atoms of the ligand to have an octet of valence electrons). The catalyst component is optionally combined with an activator, typically for the purpose of generating a highly active monocationic or dicationic polymerization catalyst, and the catalyst and/or catalyst components may be in solution, precipitated from solution, or optionally carried on a support.