Halogeno-coordinated iron corroles.

The first full assignment of (1)H NMR chemical shifts for iron corroles and the first synthesis of a series of (halogeno)iron corroles reveal very large effects of the axial ligands on the corresponding spectra, which apparently reflect differences in the relative importance of metal-to-corrole and corrole-to-metal pi-donation. These findings pave the way for a thorough analysis of the electronic structures of such complexes.