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Complexes of Diquat with Dibenzo-24-Crown-8

✍ Scribed by Shijun Li; Feihe Huang; Carla Slebodnick; Mehdi Ashraf-khorassani; Harry W. Gibson

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
219 KB
Volume
27
Category
Article
ISSN
0256-7660

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✦ Synopsis

Abstract

The 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 K~a~=2.0×10^2^ L·mol^−1^, but, as shown by X‐ray analysis, a crystalline 2:1 host:guest inclusion complex 1~2~·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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