Abstract
Two trimethylsilyl groups were introduced at 5- and 5′-positions of 2,2′-binaphthalene to improve the solubility of 2,2′-binaphthalene-based receptors. The X-ray crystallographic analysis revealed the twisted structure of 2 in the solid state. The solubility of 2 was moderately improved by 3.1-fold comparing with mother skeleton 1. As a practical example of 2, receptor 8 bearing two aza-15-crown-5 moieties was prepared and the selective binding of 8 with Ba2+ can be observed by the formation of sandwich-like complex, which shows no prevention of binding ability of the receptor by introduction of the bulky substituents.
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This work was supported in part by a Grant-in-Aid for Scientific Research (C) from Japan Society for the Promotion of Science, The Salt Science Research Foundation, Nos. 1006 and 1104, and a research grant from The Mazda Foundation.
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Kondo, Si., Watanabe, N., Takahashi, F. et al. Synthesis and photophysical properties of 2,2′-binaphthalene-based receptor bearing trimethylsilyl groups to improve the solubility. J Incl Phenom Macrocycl Chem 75, 31–38 (2013). https://doi.org/10.1007/s10847-012-0142-8
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DOI: https://doi.org/10.1007/s10847-012-0142-8