Syntheses and spin–spin exchange interactions of calix[4]arene biradicals

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• 作者：Xiaojun Hu ; Haijun Yang ; Yong Li
• 关键词：Calix[4]arene ; Nitroxide biradical ; Spin– ; spin exchange interaction ; ESR
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2008
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：July 2008
• 卷：70
• 期：2
• 页码：439-444
• 文件大小：624 K

摘要

Three novel paramagnetic calix[4]arenes (2, 3 and 4) with two opposite nitroxide radicals on the upper rims were synthesized and characterized. The through-space spin–spin exchange interactions of these calixarene biradicals were investigated, and found to be affected by many factors, such as molecular conformational flexibility, steric hindrance, temperature, solvent effect and complexation of silver ion.