N-(Di)icosyl-Substituted Benzo[a]phenoxazinium Chlorides: Synthesis and Evaluation as Near-Infrared Membrane Probes
作者:Sarala Naik、Carla M. A. Alves、Paulo J. G. Coutinho、M. Sameiro T. Gonçalves
DOI:10.1002/ejoc.201001579
日期:2011.5
Five benzo[a]phenoxaziniumchlorides 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