Facile synthesis and anion binding studies of fluorescein/benzo-12-crown-4 ether based bis-dipyrromethane (DPM) receptors

Abstract

Two novel fluorescein as well as benzo-12-crown-4 ether functionalized dipyrromethane receptors (DPM3 and DPM4) have successfully been synthesized.

Evaluation of naked-eye sensing and anion binding studies in meso-fluorescein substituted one-walled calix[4]pyrrole (C4P)

“…However, the meso -substituted aromatic protons display slight upfield shift from δ 6.59 ppm to δ 6.44 ppm and δ 6.48 ppm to δ 6.41 ppm, which confirms anion–π interaction. 50,53 Besides, these observation, β-pyrrolic protons of the C4P7 also showed upfield shift – revealing the change in the conformation of C4P7 from 1,3-alternate to the cone conformation.…”

“… 49 The limit of detection (LOD) for this system was found to be 3 × 10 −5 M. Notably, in the year of 2023, our research group has also reported a valuable fluorescein functionalized dipyrromethane (DPM) based chemosensor for the selective detection of fluoride, phosphate and acetate ions over various other tested anions. 50 …”