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: The crystal structure of tetraacetyl fluorescein hydrazide (FHTA) was determined by X-ray diffraction as discussed by the authors, and the final R value was 0.0927 for 3189 reflections.
Abstract: The crystal structure of tetraacetyl fluorescein hydrazide (FHTA) was determined by X-ray diffraction. This compound crystallized in the monoclinic, space group P21/n with a = 8.889(2)A, b = 14.379(3)A, c = 19.920(5)A, β = 96.629(4)°, V = 2529.0(10)A3, Z = 4. The final R value was 0.0927 for 3189 reflections [I > 2σ(I)]. The dihedral angle between the xanthene and spirolactam rings systems is 87.45(4)°. Also, the xanthene scaffold is bent due to acetylation, and the end rings of xanthene are inclined to each other at an angle of about 21.52(8)°.
1 citations
Patent•
01 Jan 2018
TL;DR: In this paper, the authors proposed a quencher which can sufficiently quench the fluorescence from fluorescent compounds including xanthene-based dyes, including dyes based on the following general formula (1):
Abstract: Quenchers of the related art do not have a quenching ability high enough to sufficiently inhibit the emission of fluorescence from fluorescence compounds. Therefore, the present invention aims to provide a quencher which can sufficiently quench the fluorescence from fluorescent compounds including xanthene-based dyes. The present invention relates to a quencher formed of a compound represented by the following general formula (1), and the like. (In the formula, n 1 pieces of R 5 each independently represent a group having a polymerizable unsaturated group, an amino group having a substituent, or the like, R 6 represents a group having a polymerizable unsaturated group, a hydroxy group, or the like, An - represents an anion, Ar 1 represents a specific ring structure, * and ** each represent a position of bonding to the specific ring structure, Ar 2 represents a benzene ring or the like, in a case where Ar 2 is the benzene ring, n 1 represents an integer of 0 to 4, and R 32 and R 33 each independently represent an alkyl group or an aryl group.)
1 citations
TL;DR: In this paper, the authors used CuO nanoparticles as catalysts for the synthesis of xanthene derivatives (III and VI) and showed that they can be used as a catalyst for the extraction of Xanthen derivatives.
Abstract: CuO nanoparticles are used as catalyst for the synthesis of xanthene derivatives (III) and (VI).
1 citations
TL;DR: This study reported one new turn-off fluorescent sensor for Cu2+ with a benzo[k,l]xanthene core, which served as an efficient cation sensor for copper ion over a wide range of other cations owing to the catechol group in the aromatic core.
Abstract: Rapid and efficient analyses of copper ions are crucial to providing key information for Cu2+ in living cells because of their biological importance. In this study, we reported one new turn-off fluorescent sensor for Cu2+ with a benzo[k,l]xanthene core, which served as an efficient cation sensor for copper ion over a wide range of other cations (Na+, K+, Ag+, Hg2+, Cd2+, Co2+, Ni2+, Zn2+, Mg2+, and Fe3+) owing to the catechol group in the aromatic core. The sensor showed selectivity for Cu2+ over other ions; the logKβ for Cu2+ binding to compound 1 had a value of 13.265. In the presence of Cu2+, sensor 1 provided significant fluorescence decrement; Co2+, and Ni2+ caused a fluorescence decrement when employed at a higher concentration than Cu2+, while Na+, K+, Hg2+, Cd2+, Zn2+, and Mg2+ metal ions produced only minor changes in fluorescence intensity. Fluorescence experiments demonstrate that compound 1 may have an application as a fluorescent probe for detecting Cu2+ with a limit of detection of 0.574 µM.
1 citations
1 citations