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Sensors 2007, 7(12), 3166-3178; doi:10.3390/s7123166

Thermally Stable Merocyanine Form of Photochromic Spiropyran with Aluminum Ion as a Reversible Photo-driven Sensor in Aqueous Solution

Key Laboratory for Advanced Materials & Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China
Author to whom correspondence should be addressed.
Received: 30 October 2007 / Accepted: 3 November 2007 / Published: 6 December 2007
(This article belongs to the Special Issue Supramolecular Sensors)
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A reversible photo-driven sensor for aluminum ions based on photochromicspiropyran was reported with rapid response time. The detection of aluminum wasperformed via the chelation of aluminum ions with the merocyanine form (MC) ofphotochromic spiropyran. 1H NMR studies confirmed the conversation from the MC forminto the Al3+ -MC form. Addition of aluminum ions to the spiropyran (SP) in a MeCN/H2Omixture results in obvious color changes with a loss in absorbance at 539 nm and anenhancement in absorbance at about 420 nm after irradiation at 365 nm. The metal chelationcomplex (Al3+ -MC) can also be converted into the original SP form by irradiation withvisible light. Aluminum ions can be detected down to 0.5 μM levels in a fast response ofless than 5 seconds with no interference from other ionic species. View Full-Text
Keywords: photo-driven; photochromic spiropyran; sensor; aluminum ion. photo-driven; photochromic spiropyran; sensor; aluminum ion.

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ren, J.; Tian, H. Thermally Stable Merocyanine Form of Photochromic Spiropyran with Aluminum Ion as a Reversible Photo-driven Sensor in Aqueous Solution. Sensors 2007, 7, 3166-3178.

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