[2.2.2]Metacyclophane (MCP) tweezers 7 and azo[2.2.2]MCP tweezers 8 were prepared from 21-nitro[2.2.2]MCP 2, which was obtained by the ipso-nitration of [2.2.2]MCP 1. X-Ray crystal structural analysis shows the MCP tweezers 7 to have the anti-conformation. The photothermal isomerization of azo[2.2.2]MCP tweezers 8 was studied by UV spectroscopy, and the activation energy of the thermal cis-trans isomerization was determined by UV measurements at variable temperatures to be E‡ = 71 ± 7 kJ mol-1. The complexation constant of 8 with silver ions was determined by the Benesi-Hildebrand method to be 73 ± 3 L mol-1.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Perkin Transactions 1|
|Publication status||Published - 2000|
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