Abstract
The photoresponsive calix [4] arene (2), which is modified with azobenzenemoiety on the lower rim of the calix, has been prepared. Photoisomerizationof 2 was performed with photoirradiation by 500 W-Xe lamp using Corning 7-37 filter. The liquid-liquid extraction of various metal cations by 2 in thefashion of photoirradiated isomers and non-photoirradiated isomer (trans one) using picrate counter ions has been studied. The calixarene (2) shows higherbinding ability for almost all metal cations examind in the 12 h photoirradiatedisomer than those of trans isomer and non-modified calix [4] arene (3), which has a same structure on the upper rim of the calix.
