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 paper, a fast and sensitive determination of gaseous ozone based on a chemiluminescence reaction with gallic acid and xanthene dyes in the chemilumininescence aerosol detector is described.
17 citations
Patent•
24 Nov 1971TL;DR: In this paper, a procedure for their preparation for their preparation is described for reducing the number of XANTHYDROL end-governing groups to reduce the cost.
Abstract: POLYKETONES DERIVED FROM DIPHENYL ETHER AND TEREPHTHALOYL AND ISOPHTHALOYL HALIDES BY FRIEDEL-CRAFTS SYNTHESIS HAVING SUPERIOR MELT STABILITY, AND A PROCESS FOR THEIR PREPARATION COMPRISING REDUCING XANTHYDROL ENDGROUPS TO XANTHENE GROUPS.
17 citations
TL;DR: A series of poly(ether imide)s bearing flexible ether and bulky xanthene pendant groups was prepared from 9,9-bis[4-aminophenoxy)phenyl]xanthene with six commercially available aromatic tetracarboxylic dianhydrides in N,N-dimethylacetamide (DMAc) via the poly(amic acid) precursors and subsequent thermal or chemical imidization as discussed by the authors.
Abstract: A series of new cardo poly(ether imide)s bearing flexible ether and bulky xanthene pendant groups was prepared from 9,9-bis[4-(4-aminophenoxy)phenyl]xanthene with six commercially available aromatic tetracarboxylic dianhydrides in N,N-dimethylacetamide (DMAc) via the poly(amic acid) precursors and subsequent thermal or chemical imidization. The intermediate poly(amic acid)s had inherent viscosities between 0.83 and 1.28 dL/g, could be cast from DMAc solutions and thermally converted into transparent, flexible, and tough poly(ether imide) films which were further characterized by X-ray and mechanical analysis. All of the poly(ether imide)s were amorphous and their films exhibited tensile strengths of 89–108 MPa, elongations at break of 7–9%, and initial moduli of 2.12–2.65 GPa. Three poly(ether imide)s derived from 4,4′-oxydiphthalic anhydride, 4,4′-sulfonyldiphthalic anhydride, and 2,2-bis(3,4-dicarboxyphenyl))hexafluoropropane anhydride, respectively, exhibited excellent solubility in various solvents such as DMAc, N,N-dimethylformamide, N-methyl-2-pyrrolidinone, pyridine, and even in tetrahydrofuran at room temperature. The resulting poly(ether imide)s with glass transition temperatures between 286 and 335°C had initial decomposition temperatures above 500°C, 10% weight loss temperatures ranging from 551 to 575°C in nitrogen and 547 to 570°C in air, and char yields of 53–64% at 800°C in nitrogen. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
17 citations
TL;DR: The study found that there were variations in the modes and stoichiometries of TIF binding with different F1preparations, enzyme preparations, which were otherwise indistinguishable on the basis of sedimentation coefficient, specific activity, or subunit composition.
Abstract: Publisher Summary This chapter discusses specific interactions of xanthene dyes with nucleotide-binding sites of membrane energy-transducing enzymes and carriers It investigates the interaction of a wide number of xanthene and related dyes with a variety of (di) nucleotide-dependent enzymes, including mitochondrial F1- adenosine triphosphatase (ATPase) and several kinases and dehydrogenases The chapter presents data from inhibition studies employing over 45 different dyes Two of the xanthene dyes, tetraiodofluorescein (TIF) and tetraiodotetrachlorofluorescein (Rose bengal), were found to be potent inhibitors of both adenosine triphosphate (ATP)/ adenosine diphosphate (ADP) and NAD+/NADH-dependent enzymes On the basis of a number of criteria including availability; ease of purification; high molar absorptivity; ease of modification and conversion into affinity and photoaffinity active site labeling reagents; synthesis of the radiolabeled derivative; and inherent photochemical and photophysical properties, TIF was selected as the choice nucleotide site probe The study found that there were variations in the modes and stoichiometries of TIF binding with different F1preparations, enzyme preparations, which were otherwise indistinguishable on the basis of sedimentation coefficient, specific activity, or subunit composition Model enzyme studies employing native nucleotide displacement of nucleotide site-bound TIF demonstrated the potential utility of the approach toward a facile examination of the cooperativity associated with nucleotide binding to the more complex, multisite oligomeric F1 The site stoichiometries obtained for TIF binding and native nucleotide replacement of bound TIF are in precise agreement with the known nucleotide binding capacity and subunit stoichiometry of F1
17 citations
TL;DR: The distinct dependence of emission of rhodamines bound to micelles on pH of bulk water opens the possibility of using them as fluorescent interfacial acid-base indicators.
17 citations