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.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this article, a series of novel water-soluble derivatives of Rose bengal have been presented, which make it possible to carry out photooxidation in water even at low pHs.
3 citations
•
28 Sep 1990TL;DR: In this paper, a process for cross-linkable polymers that are crosslinkable by free radicals and/or contain aromatic rings by heating these polymers with a compound containing xanthene groups was described.
Abstract: This invention relates to a process for cross-linking polymers that are crosslinkable by free radicals and/or contain aromatic rings by heating these polymers with a compound containing xanthene groups. The crosslinked polymers have improved chemical resistance.
3 citations
••
TL;DR: In xanthene-9-carboxylic acid, C14H10O3, hydrogen bonding is of the cyclic dimer type but involves two crystallographically inequivalent molecules and does not occur about a center of symmetry.
Abstract: In xanthene-9-carboxylic acid, C14H10O3, hydrogen bonding is of the cyclic dimer type but involves two crystallographically inequivalent molecules and does not occur about a center of symmetry. The carboxylic H atoms are ordered. The dihedral angle (fold angle) of the xanthene core is 14.2 (1) degree for molecule A and 11.3 (2) degrees for molecule B. The planes of the carboxyl groups are almost perpendicular to the xanthene cores.
3 citations
••
TL;DR: In this paper, a high lasing efficiency and a long operational life were obtained for dyes 11A and 11B of the xanthene series, used to impregnate a modified polymethyl methacrylate polymer matrix.
Abstract: A high lasing efficiency (up to 70%) and a long operational life (over 6×104 pulses from a fixed excitation region) were obtained for dyes 11A and 11B of the xanthene series, used to impregnate a modified polymethyl methacrylate polymer matrix.
3 citations
••
TL;DR: In this article, two 2,3- and 3,4-dihydroxyphenyl substituted rosamines (3 and 4, respectively) were successfully synthesized through a microwave-assisted protocol.
Abstract: Functional organic dyes play a key role in many fields, namely in biotechnology and medical diagnosis. Herein, we report two novel 2,3- and 3,4-dihydroxyphenyl substituted rosamines (3 and 4, respectively) that were successfully synthesized through a microwave-assisted protocol. The best reaction yields were obtained for rosamine 4, which also showed the most interesting photophysical properties, specially toward biogenic amines (BAs). Several amines including n- and t-butylamine, cadaverine, and putrescine cause spectral changes of 4, in UV–Vis and fluorescence spectra, which are indicative of their potential application as an effective tool to detect amines in acetonitrile solutions. In the gas phase, the probe response is more expressive for spermine and putrescine. Additionally, we found that methanolic solutions of rosamine 4 and n-butylamine undergo a pink to yellow color change over time, which has been attributed to the formation of a new compound. The latter was isolated and identified as 5 (9−aminopyronin), whose solutions exhibit a remarkable increase in fluorescence intensity together with a shift toward more energetic wavelengths. Other 9-aminopyronins 6a, 6b, 7a, and 7b were obtained from methanolic solutions of 4 with putrescine and cadaverine, demonstrating the potential of this new xanthene entity to react with primary amines.
3 citations