Bis[3-tert-butyl-5-(N-oxy-tert-butylamino)phenyl] Nitroxide in a Quartet Ground State: A Prototype for Persistent High-Spin Poly [(oxyimino)-1,3-phenylenes]

Article abstract of DOI:10.1021/ja00011a028

The title trinitroxide 4 was synthesized via the bis[m-(hydroxyamino)phenyl] nitroxides 9 and 10. The ESR spectra obtained in a toluene glass at 4.2 K was consistent with 4 in a quartet state with the zfs parameter |D|/hν of 0.0087 cm^-1. The quartet state was shown to be the ground state by the magnetic measurement of its microcrystalline sample on a Faraday balance. The maximum of the effective moment was 3.53 μ_B at ca. 140 K. The Weiss constant and the energy gap between the lowest excited doublet and the ground quartet states were estimated to be -19 and +240 K, respectively.