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- W2083403350 abstract "Self-assembled capsules are hosts that recognize and surround smaller molecule guests of appropriate size, shape, and chemical surfaces. The space available inside is a cage of fixed solvent molecules, many of which are aromatic. These aromatics provide anisotropic shielding to guests, and a map of induced magnetic shielding for the inner space can be obtained through nucleus-independent chemical shift calculations. Experimental values of the magnetic environment can be determined by NMR spectra of the guests inside. We describe here the environment in a cylindrical capsule with tapered ends. A series of terminal acetylenes—the narrowest of organic structures—was synthesized and used to probe the magnetic shielding of the capsule’s ends. Their NMR spectra showed that the acetylenic hydrogen experiences deshielding as it is forced deeper into the tapered end of the capsule where four benzene rings converge. Modeling and density functional theory calculations provided excellent agreement with the experimental values and established a molecular ruler to explore steric and magnetic environments inside the capsule." @default.
- W2083403350 created "2016-06-24" @default.
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- W2083403350 date "2006-06-13" @default.
- W2083403350 modified "2023-09-23" @default.
- W2083403350 title "Experimental and computational probes of the space in a self-assembled capsule" @default.
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- W2083403350 doi "https://doi.org/10.1073/pnas.0602781103" @default.
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