The synthesis of macrocyclic arylamines 3 and 4 is reported. These structures yield conformationally rigid polyradical cations for investigation of their electron spin properties. Dication 32+ has dual N and N‘ connection of its p-phenylenediamine radical cation units via 2,7-naphthalene bridges. By ESR and NMR analysis, 32+ is found to possess a populated, low-lying triplet excited state. Macrocycle 4 undergoes multielectron oxidation as observed by cyclic voltammetry to yield polycations with more limited kinetic stability.
No takes yet. Share an insight, caveat, or question.
Selby et al. (1999) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: