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Synthesis and spectral characterisation of naphtho[2,3-a]phenoxazinium salts
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1  Centro de Química, Universidade do Minho, Gualtar, 4710-057 Braga, Portugal

Abstract: A series of new functionalised naphtho[2,3-a]phenoxazinium chlorides was synthesised by condensation of 5-ethylamino-2-nitrosophenol hydrochloride with 1-aminoanthracene and its N-substituted derivatives. These cationic dyes showed maximum absorption in the range between 590 and 647 nm and strong fluorescence with maximum emission wavelengths between 630 and 674 nm, as well as high fluorescent quantum yields in ethanol and water at physiological pH.
Keywords: n/a