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Molecules 2017, 22(9), 1569;

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

Department of Chemistry, Sunchon National University, Suncheon, Jeonnam 57922, Korea
Author to whom correspondence should be addressed.
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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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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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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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