Herein we report the experimental observation (X-ray characterization) of an anion-anion complex (anion = hydrogen fumarate) stabilized by H-bonds that is trapped in a secondary squaramide receptor. High level ab… Click to show full abstract
Herein we report the experimental observation (X-ray characterization) of an anion-anion complex (anion = hydrogen fumarate) stabilized by H-bonds that is trapped in a secondary squaramide receptor. High level ab initio calculations indicate that the anion-anion complex is thermodynamically unstable but kinetically stable with respect to the isolated anions.
               
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