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. Author manuscript; available in PMC: 2019 Nov 7.
Published in final edited form as: J Am Chem Soc. 2018 Oct 22;140(44):14807–14822. doi: 10.1021/jacs.8b08349

Figure 2.

Figure 2

Displacement ellipsoid plots (50% probability level) for 1 – 4 at 110(2) K. The triflate counterions in 2 and 3, and hydrogen atoms in 1 – 4 (except those on N4) have been omitted for clarity.