24460-06-8Relevant articles and documents
A fluoran-based fluorescent probe via a strategy of blocking the intramolecular photoinduced electron transfer (PET) process
Huang, Kun,He, Song,Zeng, Xianshun
, p. 2004 - 2008 (2017)
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.
Absorption, fluorescence, and acid-base equilibria of rhodamines in micellar media of sodium dodecyl sulfate
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)
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.