Preparation and structures of novel [2.2.2]metacyclophane tweezers

Tsuyoshi Sawada, Masaki Yamada, Thies Thiemann, Shuntaro Mataka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


[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.

Original languageEnglish
Pages (from-to)2623-2627
Number of pages5
JournalJournal of the Chemical Society, Perkin Transactions 1
Issue number16
Publication statusPublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry


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