An indolino-spironaphthooxazine probe for colorimetric detection of ferric ions in drinking water

Abstract

The sensing performance of a novel indolino-spironaphthooxazine derivative (SPNO), 6’(3,4-dihydroisoquinolin-2(1H)-yl)-3,3-dimethyl-1-phenethylspiro[indoline-2,3’-naphtho[2,1-b][1,4]oxazine], was investigated for rapid colorimetric detection of ferric ions (Fe3+) in drinking water. Under the optimized conditions in 1,4-dioxane:water (7:3,...

Spirooxazine-Based Dual-Sensing Probe for Colorimetric Detection of Cu2+ and Fe3+ and Its Application in Drinking Water and Rice Quality Monitoring

“… 44 , 45 This process results in the formation of an open-ring form, also known as merocyanine, which can serve as an active ligand to selectively coordinate with a metal ion and produce a merocyanine–metal complex. 46 Recently, some spirooxazine probes showed high selectivity for the detection of metal ions, including Mg 2+ , Al 3+ , Fe 3+ , Co 2+ , Zn 2+ , Hg 2+ , and CH 3 Hg + . 47 − 53 However, few studies of spirooxazine probes for Cu 2+ detection have been described, and to the best of our knowledge, the spirooxazine as a dual probe for Cu 2+ and Fe 3+ detection has not yet been reported.…”

“…The specific ion recognition modulated by spirooxazine occurs via ring opening together with metal–ligand complexation. Typically, the ring-opening reaction of spirooxazine proceeds through bond cleavage at the spiro carbon (C spiro –O), which is induced by either electromagnetic radiation or metal ion stimuli. , This process results in the formation of an open-ring form, also known as merocyanine, which can serve as an active ligand to selectively coordinate with a metal ion and produce a merocyanine–metal complex . Recently, some spirooxazine probes showed high selectivity for the detection of metal ions, including Mg 2+ , Al 3+ , Fe 3+ , Co 2+ , Zn 2+ , Hg 2+ , and CH 3 Hg + . − However, few studies of spirooxazine probes for Cu 2+ detection have been described, and to the best of our knowledge, the spirooxazine as a dual probe for Cu 2+ and Fe 3+ detection has not yet been reported.…”