Synthesis and Magnetic Property of 4,4′-(2,6-Anthracenediyl)bis(2,6-di-tert-butylphenoxyl) Diradicaloids

Anthracene based phenoxyl diradicaloids are synthesized. The UV–vis spectra of them give absorption maxima around 700 nm attributes to the extended quinone structure. The diradical characters y of them are estimated as ∼0.6 from their static magnetic susceptibility and absorption maxima. The extended π-conjugated anthracene-linker enhances the diradical characters compared to the phenylene linker. It is noteworthy that these enhanced diradical characters are accomplished without steric effects.