Photoresponsive lower-rim azobenzene substituted and bridged calix[4]arenes

Multi‐stimuli‐responsive Polymers Based on Calix[4]arenes and Dibenzo‐18‐crown‐6‐ethers

“…They have also been used as core molecules for the preparation of star polymers 105 and dendrimers 106 , as well as in the preparation of alternating copolymers with tetrathiophene 107 . Different azocalixarenes have been prepared in the past, where the azo unit is introduced into the upper 108 or lower rim 109 in most cases with the purpose of metal ion detection 110 . However, systems incorporating more than one azocalixarene are rare 111 .…”

Novel photo-switchable polymers based on calix[4]arenes

“…Using the upper rim of the calix [4]arene moieties as the linking point in the preparation of oligomers has also been reported. 11 Numerous azocalix [4]arene derivatives have been prepared by introducing the azo group into either the upper 12 or the lower rim 13 of the molecules, thus yielding units in the system capable of photoisomerisation. However only limited examples exist of more complex structures 14 bearing a larger amount (n > 1) of azocalix [4]arene moieties.…”