The synthesis and spectroscopic characterisation of some representative N-alkyl-substituted quaternaryammoniumsalts derived from benzothiazole, benzoxazole, benzo-selenazole, 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
The Synthesis and Light Absorption Behaviour of Novel Coumarin Chromophores
作者:Kyoung Lyong An、Seung Rim Shin、Kun Jun、Soo Youl Park
DOI:10.5012/jkcs.2014.58.3.297
日期:2014.6.20
The synthetic route to coumarin systems is well established and one approach of particular interest leads to the intermediate 7-diethylamino-3-formylcoumarin. A combination of the N,N-diethylamino-coumarin donor with a wide range of acceptor groups of varying electron withdrawing strength should permit the synthesis of a series of extended coumarin dyes with absorption maxima range from 500 to 600 nm, or even beyond. In this communication, a novel efficient synthesis of indoles, benzothiazole and benzoxazole based on coumarin chromophores were achieved and the coloristic and fluorophoric properties of these chromophores were studied.