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A 3 nm-sized cage-shaped Hg 6 L 4 complex with large openings was quantitatively formed from trismonodentate ligand (L) and Hg 2+ ions in a self-assembled manner. The cage complex shows reversible interconversion with a capsule-shaped Hg 6 L 8 complex in response to the ratio of ligand to Hg 2+ . This structural switching is coupled with reversible ON/OFF switching of fluorescence between fluorescent Hg 6 L 8 capsule and nonfluorescent Hg 6 L 4 cage.
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Harano et al. (2007) studied this question.
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