Pardal, Ana CristinaRamos, S.S.Santos, P. F.Reis, L. V.Almeida, P.2011-09-262011-09-262002Pardal, A.C., Ramos S.S., Santos P.F., Reis, L.F.& Almeida, P. (2002). Synthesis and spectroscopic characterisation of n-alkyl quaternary ammonium salts typical precursors of cyanines. Molecules, 7, 320-330.ISSN 1420-3049http://hdl.handle.net/10400.26/1295The 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.engHeterocyclic quaternary ammonium saltsCyanines precursorsSpectroscopic characterisationjournal article