[1.1](3,3‘)-Azobenzenophane: Novel Crystal Structure and Cis−Trans Isomerization of Distorted Azobenzene
2002; American Chemical Society; Volume: 4; Issue: 22 Linguagem: Inglês
10.1021/ol026760r
ISSN1523-7060
AutoresYasuo Norikane, Kogorou Kitamoto, Nobuyuki Tamaoki,
Tópico(s)Synthesis and Properties of Aromatic Compounds
Resumo[formula: see text] [1.1](3,3')-Azobenzenophane, in which two azobenzenes are cyclically connected by -CH2- chains at the meta positions, has been synthesized. The crystal structures of all isomers have been revealed. This is the first report on the crystal structure of the cis isomer of macrocyclic azobenzenes. The trans,trans isomer was slightly distorted, the trans,cis isomer highly deformed, and the cis,cis isomer unstrained. The thermal stability of cis isomers in solutions are deducible from the crystal structures.
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