- A fluoran-based fluorescent probe via a strategy of blocking the intramolecular photoinduced electron transfer (PET) process
-
A novel fluoran-based fluorescent probe 2 has been designed and synthesized by using a strategy of blocking the intramolecular photoinduced electron transfer (PET) process. The probe keeps a ring-closed spirolactone structure in aqueous buffer solution. However, the oxidation of the probe by ClO? perturbs a new equilibrium of the structural interconversion between the nonfluorescent spirolactone and the fluorescent ring-opened zwitterion, which generates a highly selective fluorescent probe for ClO?. Meanwhile, the probe is cell membrane permeable and can be utilized as fluorescent probe for imaging ClO? in living cells.
- Huang, Kun,He, Song,Zeng, Xianshun
-
-
Read Online
- QUENCHER
-
A quencher is disclosed having a compound represented by the following general formula (1): wherein R5 each independently represent a halogen atom, an alkyl group, an alkoxy group, an alkylthio group, an amino group having a substituent or not having a substituent, a hydroxy group, an aryl group, an aryloxy group, or an arylalkyl group; R6 represents a group having a polymerizable unsaturated group, a hydroxy group, or the like; Y1 represents an oxygen atom, or the like; An? represents an anion; Ar1 represents a specific ring structure; * and ** represent binding positions; Ar2 represents a benzene ring, a naphthalene ring, or an anthracene ring; n1 represents a specific integer; and the following structure (1-10) in the general formula (1) is an asymmetric structure; (wherein R5, Y1, Ar1, Ar2, n1, * and ** are the same as described above.).
- -
-
Paragraph 0678
(2018/01/04)
-
- Absorption, fluorescence, and acid-base equilibria of rhodamines in micellar media of sodium dodecyl sulfate
-
Rhodamine dyes are widely used as molecular probes in different fields of science. The aim of this paper was to ascertain to what extent the structural peculiarities of the compounds influence their absorption, emission, and acid-base properties under unified conditions. The acid-base dissociation (HR+???R?+?H+) of a series of rhodamine dyes was studied in sodium n-dodecylsulfate micellar solutions. In this media, the form R exists as a zwitterion R±. The indices of apparent ionization constants of fifteen rhodamine cations HR+ with different substituents in the xanthene moiety vary within the range of pKaapp?=?5.04 to 5.53. 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.
- Obukhova, Elena N.,Mchedlov-Petrossyan, Nikolay O.,Vodolazkaya, Natalya A.,Patsenker, Leonid D.,Doroshenko, Andrey O.,Marynin, Andriy I.,Krasovitskii, Boris M.
-
p. 138 - 144
(2016/07/21)
-
- Reversibly thermochromic systems based on pH-sensitive spirolactone-derived functional dyes
-
Composites formulated from pH-sensitive colour formers mixed with fatty acid co-solvents and acidic developers have been prepared and their thermochromic properties investigated. Possible explanations for the thermochromic effect have been considered and evidence is presented in support of a mechanism based on phase changes occurring within the compositions during heating and cooling. British Crown Copyright 1998/MOD. Published with the permission of the Controller of Her Britannic Majesty's Stationery Office.
- Burkinshaw, Stephen M.,Griffiths, John,Towns, Andrew D.
-
p. 2677 - 2683
(2007/10/03)
-
