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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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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