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Molecules 2017, 22(9), 1569; doi:10.3390/molecules22091569

Spiropyran-Isoquinoline Dyad as a Dual Chemosensor for Co(II) and In(III) Detection

Department of Chemistry, Sunchon National University, Suncheon, Jeonnam 57922, Korea
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Received: 4 August 2017 / Accepted: 10 September 2017 / Published: 19 September 2017
(This article belongs to the Special Issue Advances in Spiro Compounds)
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Abstract

Spiropyran derivatives have been studied as light-regulated chemosensors for a variety of metal cations and anions, but there is little research on chemosensors that simultaneously detect multiple metal cations. In this study, a spiropyran derivative with isoquinoline, SP-IQ, was prepared and it functions investigated as a light-regulated sensor for both Co2+ and In3+ cations. A colorless nonfluorescent SP-IQ converts to a pink-colored fluorescent MC-IQ by UV irradiation or standing in the dark, and MC-IQ returns to SP-IQ with visible light. Upon UV irradiation with the Co2+ cation for 7 min, the stronger absorption at 540 nm and the similar fluorescence intensity at 640 nm are observed, compared to when no metal cation is added, due to the formation of a Co2+ complex with pink color and pink fluorescence. When placed in the dark with the In3+ cation for 7 h, the colorless solution of SP-IQ changes to the In3+ complex with yellow color and pink fluorescence, which shows strong absorption at 410 nm and strong fluorescence at 640 nm. Selective detection of the Co2+ cation with UV irradiation and the In3+ cation in the dark could be possible with SP-IQ by both absorption and fluorescence spectroscopy or by the naked eye. View Full-Text
Keywords: spiropyran; isoquinoline; chemosensor; cobalt; indium spiropyran; isoquinoline; chemosensor; cobalt; indium
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Kho, Y.-M.; Shin, E.J. Spiropyran-Isoquinoline Dyad as a Dual Chemosensor for Co(II) and In(III) Detection. Molecules 2017, 22, 1569.

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