Allison Fleshman’s favorite structure is:

Poly(ethylene oxide)3:LiCF3SO3

PEOLiTf_Zardalidis

Source: Zardalidis, et al. Macromolecules, 2013, 46,
2705-2714

Why?

The phase diagram of the 3:1 compound of  polyethylene oxide with lithium Trifluoromethanesulfonate is beautiful! It's also a common crystal in the polymer electrolyte world. I consider it an 'old friend'.
Allison Fleshman

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