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Molecular complexes in solution containing benzene-substituted crown ethers and tropylium ions

✍ Scribed by Markku Lämsä; Toivo Kuokkanen

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 568 KB
Volume: 9
Category: Article
ISSN: 0894-3230
DOI: 10.1002/(sici)1099-1395(199601)9:1<21::aid-poc751>3.0.co;2-g

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✦ Synopsis

The interaction of benzo-15-crown-5, benzo-18-crown-6, dibenzo-18-crown-6, dibenzo-24-crown-8, and dibenzo-30-crown-10 with tropylium tetrafluoroborate in 1,2-dichloroethane was studied by spectroscopic methods. The stoichiometries of the complexes in the gas phase were investigated by fast atom bombardment mass spectrometry. The crown ethers formed 1 : 1 molecular complexes with the acceptors, apparently by a charge-transfer mechanism. The stability constant K and the molar absorptivity of the complex cc were determined by the method of Rose and Drago. The magnitudes of the thermodynamic parameters of complexation were calculated. A discussion of the thermodynamic parameters is included.

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