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Molecules 2002, 7(3), 320-330; doi:10.3390/70300320
Article

Synthesis and Spectroscopic Characterisation of N-Alkyl Quaternary Ammonium Salts Typical Precursors of Cyanines

1, 2, 1, 1 and 2,*
1 Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, Apartado 202, 5001-911 Vila Real Codex, Portugal 2 Departamento de Química e Unidade de Materiais Têxteis e Papeleiros, Universidade da Beira Interior, Rua Marquês d'Ávila e Bolama, 6200-001 Covilhã, Portugal
* Author to whom correspondence should be addressed.
Received: 23 October 2001 / Revised: 18 February 2002 / Accepted: 26 February 2002 / Published: 31 March 2002
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Abstract

The synthesis and spectroscopic characterisation of some representative N-alkylsubstituted quaternary ammonium salts derived from benzothiazole, benzoxazole, benzoselenazole, indole and quinoline are described. These heterocyclic salts, bearing an activated methyl group in the 2-position in relation to the nitrogen atom and N-methyl, -pentyl, -hexyl and -decyl chains, are typical precursors of cyanine dyes.
Keywords: Heterocyclic quaternary ammonium salts; cyanines precursors; spectroscopic characterisation Heterocyclic quaternary ammonium salts; cyanines precursors; spectroscopic characterisation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Pardal, A.C.; Ramos, S.S.; Santos, P.F.; Reis, L.V.; Almeida, P. Synthesis and Spectroscopic Characterisation of N-Alkyl Quaternary Ammonium Salts Typical Precursors of Cyanines. Molecules 2002, 7, 320-330.

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