Abstract
AbstractThe complexation between dibenzo‐24‐crown‐8 (1) and diquat (2) was investigated in detail by NMR, MS and X‐ray analysis. It was found that dibenzo‐24‐crown‐8 and diquat formed a 1:1 complex 1·2 in acetone with Ka=2.0×102 L·mol−1, but, as shown by X‐ray analysis, a crystalline 2:1 host:guest inclusion complex 12·2 was isolated, in which a single molecule of diquat is enclosed in the concave cavity provided by two dibenzo‐24‐crown‐8 host molecules. Both results are different from the previously assumed stoichiometry of the complexation between dibenzo‐24‐crown‐8 and diquat. This result enriches the range of host‐guest complexes based on dibenzo‐24‐ crown‐8 and provides new opportunities for developing more complicated structures and chemosensors for diquat.
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