Calixarene‐Based Macrocyclic Nonet (<i>S</i> = 4) Octaradical and its Acyclic Sextet (<i>S</i> = 5/2) Pentaradical Analogue

Abstract

Magnetization and ESR spectroscopic data indicate a high-spin ground state (S = 4) for 1 in frozen solution. A related acyclic pentaradical also has a high-spin ground state (S = 5/2). These compounds may be the first step towards understanding the impact of defects on spin coupling in multi-site molecules.