Macrocyclic oligoarylamine-based spin system

Abstract

Alternating meta- and para-phenylene-linked oligoarylamines are considered as promising molecular parts for the molecule-based electronics and/or spintronics due to their intriguing electronic and magnetic properties. From the magnetic viewpoint, a metaphenylene linker plays a crucial role in ensuring the effective ferromagnetic interaction, while para-phenylene linker plays an important part in stabilizing the spin-containing aminium radical cations. Of the meta–para and all-meta oligoarylamines prepared so far, the macrocyclic oligoarylamines are structurally defined, and therefore we can employ them as the component pieces to prepare the two- or three-dimensionally structured oligoarylamines. The spin electronic properties of polycationic species generated from two kinds of macrocyclic oligoarylamines, which will be able to be extended into the 2D multi-spin molecular systems, are described on the basis of the pulsed electron spin resonance (ESR) measurements.