41317-10-6Relevant articles and documents
N-(di)icosyl-substituted benzo[a]phenoxazinium chlorides: Synthesis and evaluation as near-infrared membrane probes
Naik, Sarala,Alves, Carla M. A.,Coutinho, Paulo J. G.,Goncalves, M. Sameiro T.
body text, p. 2491 - 2497 (2011/06/10)
Five benzo[a]phenoxazinium chlorides containing alkyl chains with twenty carbon atoms at the 5- or 9-positions of the tetracyclic ring were efficiently synthesised and characterised by UV/Vis and NIR spectroscopy. The absorption and emission maxima in ethanol occur in the range 627-641 nm and 645-676 nm, respectively, with quantum yields varying from 0.14 to 0.38. Preliminary photophysical studies with these fluorochromophores in zwitterionic [2,3-bis(palmitoyloxy)propyl-2-(trimethylammonio)ethyl phosphate, DPPC] and cationic (N,N-dimethyl-N-octadecyloctadecan-1-aminium bromide, DODAB) vesicles were carried out. The results showed that the new benzo[a]phenoxazinium derivatives are able to detect the gel to liquid-crystalline lipid phase transition through variations in either the extent of H-aggregation or in the acid-base equilibrium. Novel benzo[a]phenoxazinium chlorides possessing icosyl groups as substituents at the 5- or 9-positions of the tetracyclic ring were photophysically studied in both zwitterionic and cationic vesicles. The results revealed that these fluorochromophores are able to detect the gel to liquid-crystalline lipid phase transition through variations either in the extent of H-aggregation or in an acid-base equilibrium. Copyright
LONG WAVELENGTH THIOL-REACTIVE FLUOROPHORES
-
Page/Page column 21; 44, (2008/06/13)
Reactive fluorescent dyes compositions and methods of using same are disclosed. Squaraine nucleus, Nile red nucleus, benzodioxazole nucleus, coumarin nucleus or aza coumarin nucleus dyes are disclosed dyes are disclosed having thiol-reactive groups. Squaraine nucleus, Nile Red nucleus, benzodioxazole nucleus, coumarin nucleus or aza coumarin nucleus dyes are disclosed that exhibit a fluorescence emission of at least about 575 nm. Biosensors are disclosed having a binding protein and a squaraine nucleus, Nile Red nucleus, benzodiaxazole nucleus, coumarin nucleus or aza coumarin nucleus.