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. 2015 Nov 6;5:15987. doi: 10.1038/srep15987

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(a) Photos of colorimetric response of TPE-S (20 μM) upon the addition of various metal ions (3 × 10⁻⁴ M). (b) Photos of the solution after 30 equiv. of t-BuOK were added to the resultant solution.