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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TL;DR: In this article, the thermal reaction between the azafullerene radical C59N• and 9-alkylsubstituted fluorenes, 9,10-dihydroanthracene, or xanthene was used to synthesize six aza[60]ful-lerene monoadducts.
Abstract: Six aza[60]fullerene monoadducts were synthesized by the thermal reaction between the azafullerene radical C59N• and 9-alkyl-substituted fluorenes, 9,10-dihydroanthracene, or xanthene. Unlike fluorenes, dihydroanthracene, and xanthene, the structurally related substituted diphenylmethanes, ethylbenzene, cumene, 1,2-diphenylethane, 5,6,11,12-tetrahydrodibenzo[a,e]cyclooctene, 10,11-dihydro-5H-dibenzo[a,d]cycloheptene, 9-methylanthracene, and 9-benzylanthracene do not lead to the isolation of azafullerene monoadducts. Moreover, 1,2-dichlorobenzene, the most commonly utilized solvent for azafullerene reactions, reacts slowly with the azafullerenyl radical C59N• affording the corresponding aza[60]fullerene monoadduct.
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TL;DR: The adsorption removal of Triphenylmethane & Xanthene dyes onto a low-cost coal-based adsorbing (Charfines) and its efficiency in dye color sorption was compared with activated carbon (F-400) as discussed by the authors.
Abstract: The adsorption removal of Triphenylmethane & Xanthene dyes onto a low-cost coal based adsorption (Charfines) and its efficiency in dye colour sorption was compared with activated carbon (F-400). Batch studies were performed and the results revealed that Charfines demonstrated on ability to adsorb the reactive Triphenylmethane & Xanthene dyes. The sorption interaction of reactive dye on to Charfines obeys the first order rate equation. The sorption data indicates that the adsorptive removal of the dye from equeous solution is rather comlex involving both boundary layer diffusion and interporticle diffusion. The process of dye sorption while activated carbon resulted in physisorption interaction. Dye sorption is found to be dependent on the aqueous phase pH and the dye uptake is greater at lower pH.
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TL;DR: In the title compound, C37H40N4O2, the xanthene and spirolactam rings are almost planar, with r.m.s. deviations from the mean planes of 0.223 and 0.057 (2) Å, respectively, and form a dihedral angle of 85.76”(3)°.
Abstract: In the title compound, C37H40N4O2, the xanthene and spirolactam rings are almost planar, with r.m.s. deviations from the mean planes of 0.223 (2) and 0.057 (2) A, respectively, and form a dihedral angle of 85.76 (3)°. The dihedral angle between the xanthene mean plane and the benzene ring is 87.16 (5)°. One of the two ethyl groups of one of the diethylamino groups is disordered over two sets of sites [0.76 (1):0.24 (1)].
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TL;DR: The d/l-enantiomers of a series of three Zn(II)tetraarylporphyrin dimers were synthesized and isolated by incorporating a bridging amide-bonded xanthene moiety at the para-position of one of the me...
Abstract: The d/l-enantiomers of a series of three Zn(II)tetraarylporphyrin dimers were synthesized and isolated by incorporating a bridging amide-bonded xanthene moiety at the para-position of one of the me...
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15 Apr 2003TL;DR: In this paper, an optical recording medium consisting of a substrate, a reflecting layer and a recording layer was proposed, where the recording layer comprises a compound of formula (I),(II),(III) having organometallic anions, and the use of lactates in the application of layers of dye to grooved substrates by spincoating.
Abstract: The invention relates to an optical recording medium comprising a substrate, a reflecting layer and a recording layer, wherein the recording layer comprises a compound of formula (I),(II),(III); wherein R 1 , to R 13 , may be hydrogen or a variety of substituents, but R 1 , and R 11 are not simultaneously hydrogen;Y m − is an inorganic, organic or organometallic anion, or a mixture thereof; Z n+ is a proton or a metal, ammonium or phosphonium cation, or a mixture thereof; m, n and o are each independently of the others an integer from 1 to 3; and p and q are each a number from 0 to 4, the ratio of o, p and q to one another, depending on the charge of the associated sub-structures, being such that there is no excess positive or negative charge in formula (I), (II) or (III). Also claimed are the use of a xanthene perchlorate in the preparation of compounds of formula (I), (II) or (III) having organometallic anions, and the use of lactates in the application of layers of dye to grooved substrates by spin-coating.