Macrocyclic High-Spin (S = 2) Molecule:Spin Identification of a Sterically Rigid Metacyclophane-Based Nitroxide Tetraradical by Two-Dimensional Electron Spin Transient Nutation Spectroscopy

摘要

Macrocyclic molecules,such as cyclophanes and calixarenes,have attracted much interest because of their ability to include various guests and the possibility of forming supra-molecular assemblies.Calixarenes functionalized by nitroxide radicals,which are widely used as stable spin sources,have been documented,revealing their peculiar properties;especially,remarkable changes in continuous-wave (cw)-ESR spectra with and without guests were observed.