Abstract
A new flexible fluorescent compound L derived from 1,5-bis(2-aminophenoxy)-3-oxapentane (A) has been synthesized by classical Schiff-base reaction between (A) and 2,2´-bithiophene carbaldehyde (B). The same synthesis was reproduced by a green methodology using an ultrasonication reaction in a classical sonication bath. The structure of the new compound was confirmed by elemental analysis, IR, 1H-NMR, MALDI-TOF-MS and EI-MS-spectra, UV-vis and fluorescence emission spectroscopy.
Highlights
In the field of fluorescence chemosensors [1] with potential applications as emissive sensing materials, different approaches have been followed for their synthesis [2,3,4]
A Schiff-base condensation is a classical reaction starting from a primary amine and an active carbonyl group as an easy way to obtain emissive compounds provided with the C=N donor-group [5,6]
Due to the interest of the above suggestion, we planned to synthesize a new emissive compound that combines together two sensing sites, which are a polyoxa chain provided with two phenolic units and two bithiophene chromophores
Summary
In the field of fluorescence chemosensors [1] with potential applications as emissive sensing materials, different approaches have been followed for their synthesis [2,3,4]. A Schiff-base condensation is a classical reaction starting from a primary amine and an active carbonyl group as an easy way to obtain emissive compounds provided with the C=N donor-group [5,6]. Due to the interest of the above suggestion, we planned to synthesize a new emissive compound that combines together two sensing sites, which are a polyoxa chain provided with two phenolic units and two bithiophene chromophores. We are reporting a simple method for synthesizing a bithiophene derivative, using classical Schiff-base condensation in ethanolic solution [7,8,9,10] and a green method using an ultrasound-assisted synthesis [11], which does not need any catalyst.
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