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Glycerol‐Triazole Conjugated Rhodamine as Colorimetric and Fluorimetric Sensor for Cu 2+
Author(s) -
Verma Abhishek,
Gahlyan Parveen,
Bawa Rashim,
Dash Soumya Ranjan,
Prasad Ashok K.,
Kumar Rakesh
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202102145
Subject(s) - chemistry , binding constant , rhodamine , detection limit , naked eye , rhodamine b , copper , stoichiometry , methylene , fluorescence , metal ions in aqueous solution , ligand (biochemistry) , analytical chemistry (journal) , ion , photochemistry , binding site , medicinal chemistry , chromatography , organic chemistry , catalysis , biochemistry , physics , quantum mechanics , photocatalysis , receptor
A glycerol‐triazole tethered rhodamine based colorimetric and fluorimetric sensor 3′,6′‐ bis (diethylamino)‐2‐(((1‐(1,3‐dihydroxypropan‐2‐yl)‐1 H ‐1,2,3‐triazol‐4‐yl)methylene)aminospiro [isoindoline‐1,9′‐xanthen]‐3‐one ( L1 ) is designed and synthesized for the selective recognition of Cu 2+ ion. The sensor L1 allows naked eye detection of Cu 2+ ion with a fast response (<1 min). Among the various metal ions tested, the sensor L1 shows selective binding with Cu 2+ through turn‐on fluorescence mechanism. The sensor shows 1 : 2 binding stoichiometry with binding constant, K a =1.1×10 6 M −2 as revealed by job's plot & Benesi‐Hildebrand plot (B−H plot), respectively. The detection limit of L1 with Cu 2+ ion is found to be 3.3 μM. Further, the experimental results are also validated using density functional theoretical (DFT) study. The optimized geometries indicates that the formation of the L1 ‐Cu 2+ complex is thermodynamically favourable by ΔG=−11.7 kcal/mol. The HOMO‐LUMO gap of the ligand L1 is found to be 3.49 eV, which decreases to 1.76 eV upon complexation with copper.