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. 2015 Jul;146(1):3–13. doi: 10.1085/jgp.201511371

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© 2015 Lockless

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Figure 4. — Crystal structures of K⁺-selective [2,2,2]cryptand. (Left) K⁺ ion is green with an average O–K⁺ distance of 2.8 Å. (Middle) Na⁺ ion is orange with an average O–Na⁺ distance of 2.6 Å. (Right) Li⁺ ion is yellow with an average O–Na⁺ distance of 2.4 Å. Structures are from Chekhlov (2003, 2005a,b).