Journal
TETRAHEDRON LETTERS
Volume 55, Issue 33, Pages 4559-4563Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2014.06.079
Keywords
Azobenzene; Acid-base indicators; Colorimetric; Absorption spectroscopy; Amino[bis(ethanesulfonate)]
Categories
Funding
- University of Malta
- Strategic Educational Pathways Scholarship (Malta) - European Social Fund (ESF) under Operational Programme II
- European Cooperation in Science and Technology (COST Action) [CM1005]
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Three azobenzene pH indicators with amino[bis(ethanesulfonate)] substituents were synthesized and studied by UV-visible absorption spectroscopy in aqueous solution. The indicators exhibit brilliant and distinct colour changes with transitions between pH 1 and 4. Significant changes were observed in the UV-visible spectra on titration with acid with pK(a) values ranging from 2.2 to 2.8. The indicators demonstrate individual changes in colour as a function of pH. These novel pH indicators complement the existing library of azobenzene indicator dyes and may be useful for environmental situations with high proton concentrations. (C) 2014 Elsevier Ltd. All rights reserved.
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