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Keywords = push-pull dicyanovinyl heterocyclic compounds

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6 pages, 1873 KiB  
Proceeding Paper
Heterocyclic Dicyanovinyl Derivatives: Synthesis and Evaluation of the Chemosensory Ability in Aqueous Solution
by Rosa Cristina M. Ferreira, Susana P. G. Costa and Maria Manuela M. Raposo
Proceedings 2017, 1(2), 30; https://doi.org/10.3390/ecsa-3-B001 - 14 Nov 2016
Cited by 1 | Viewed by 1602
Abstract
Two novel dicyanovinyl derivatives 3ab were synthesized in moderate to good yields through a Knoevenagel reaction of the corresponding aldehyde precursors and malononitrile. The photophysical properties of the new push-pull systems were studied by UV-vis and fluorescence spectroscopy in acetonitrile. The [...] Read more.
Two novel dicyanovinyl derivatives 3ab were synthesized in moderate to good yields through a Knoevenagel reaction of the corresponding aldehyde precursors and malononitrile. The photophysical properties of the new push-pull systems were studied by UV-vis and fluorescence spectroscopy in acetonitrile. The evaluation of the compounds as colorimetric chemosensors was carried out by performing spectrophotometric titrations in acetonitrile and acetonitrile/water in the presence of relevant organic and inorganic anions, and of alkaline, alkaline-earth and transition metal cations. The benzoindole derivative exhibited great selectivity for the cyanide anion over other anions in acetonitrile/water (8:2) solution showing a distinct color change from colorless to yellow. Full article
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