N-Alkyl-N-[5-(propylamino)-9H-benzo[a]phenoxazin-9-ylidene]alkan-1- aminium chlorides: synthesis and photophysical studies

M. Sameiro Gonçalves; Paulo Coutinho; Sarala Naik

doi:10.3390/ecsoc-13-00184

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N-Alkyl-N-[5-(propylamino)-9H-benzo[a]phenoxazin-9-ylidene]alkan-1- aminium chlorides: synthesis and photophysical studies

M. Sameiro T. Gonçalves

^{*

1},

Paulo J. G. Coutinho

²,

Sarala Naik

¹ Centro de Química, Universidade do Minho, Gualtar, 4710-057 Braga, Portugal
² Centro de Física, Universidade do Minho, Gualtar, 4710-057 Braga, Portugal

Published: 31 October 2009 by MDPI in The 13th International Electronic Conference on Synthetic Organic Chemistry session General Organic Synthesis

https://doi.org/10.3390/ecsoc-13-00184

Abstract: Fluorescent benzo[a]phenoxazinium chlorides with dipropyl-, dioctyl- didecyl- and didodecyl-chains as the amino substituents of the 9-positions of the tetracyclic system were synthesised in moderate to good yields. All the compounds absorbed in the wavelength range of 638-641 nm and emitted at 673 or 676 nm with quantum yields of 0.17-0.19 in ethanol.

Keywords: Benzo[a]phenoxazinium dyes; Near-infrared fluorescence probes; Cationic dyes; Nile Blue derivatives

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M. Sameiro Gonçalves

Paulo Coutinho

Sarala Naik