Abstract
Salt formation has been shown as a simple strategy to induce aggregated induced emission or aggregated enhanced emission in primary ammonium salts derived from 9-anthracene carboxylic acid, 1-pyrene carboxylic acid, 3-coumarin carboxylic acid and histamine. All the salts displayed enhanced fluorescence in their solid state compared to that in their solution state. Single crystal structure of the salt of 9-anthracene carboxylic acid i.e., His-anthracene revealed that restricted intramolecular rotation of the fluorphoric moiety (anthracene) was responsible for such radiative pathway leading to enhanced emission. A simple strategy of salt formation has been exploited to induce aggregation-induced emission or aggregation-enhanced emission in primary ammonium salts derived from 9-anthracene carboxylic acid, 1-pyrenecarboxylic acid, coumarin-3-carboxylic acid and histamine.
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