Reversible C-C Bond Breaking and Spin Equilibria in Bis(Pyrimidinenorcorrole)

Liu, B.; Li, X.; Stępień, M., Chmielewski, P. J.

Angew. Chem. Int. Ed., 2016, 55, 13142–13146 | view at publisher's site

Reversible homolytic dissociation of the bis(pyrimidinenorcorrole) σ-dimer was elucidated by means of variable temperature ESR and ¹H NMR spectroscopy, mass spectrometry, and optical spectrocopy. Dehydrogenation of the σ-dimer yielded another dimer displaying a singlet–triplet equilibrium in solution, strong NIR absorption (1570 nm), and a narrow electrochemical HOMO–LUMO gap (0.74 V).