Synthesis and reversible thermo-induced conformational transitions of a stable nitroxide biradical based on calix[4]arene.
A stable paramagnetic calix[4]arene(III) bearing two nitroxide groups on the upper rim is synthesized, which exhibits a strong intramolecular spin-spin exchange interaction and is found to be able to undergo reversible conformational transitions upon heating.
Wang
Qi
Q
Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China.
Li
Yong
Y
Wu
Guo-shi
GS