134940-41-3Relevant articles and documents
Azobenzene-Based Photoswitchable Catenanes
Bauer, Martin,Mueller, Walter Manfred,Mueller, Ute,Rissanen, Kari,Voegtle, Fritz
, p. 649 - 656 (2007/10/02)
Four catenanes (1-4) and the corresponding tetracationic monocycles 5-8 are synthesized.X-ray structural analyses allow a prediction of the mobility (circumrotation) of the "interlocked" rings in the catenanes. which is proven by 1H-NMR spectroscopy.An unexpected order in the crystal packing of 6 is demonstrated. (E/Z) isomerization in one ring influences the second ring of 1-4 and inversely.An existing obstacle inside the cavity of the switchable macrocycle can block this isomerization completely. - Key Words: Catenanes / Interlocked rings / Mechanical bond / Photoswitches