Noncovalent Paramagnetic Complexes: Detection of Halogen Bonding in Solution by ESR Spectroscopy
Tetrahedron Lett. 2006, 47, 3265
V. Mugnaini, C. Punta, R. Liantonio, P. Metrangolo, F. Recupero, G. Resnati, G. F. Pedulli, M. Lucarini
Line broadening in the ESR spectrum of DPNO after the addition of n-C8F17I.
Line broadening in the ESR spectrum of DPNO after the addition of n-C8F17I.
ABSTRACT
Halogen-bonded complexes between aliphatic and aromatic iodoperfluorocarbons and persistent nitroxide radicals have been detected by ESR spectroscopy in solution. Quantitative data indicate that nitroxides behave as strong electron donors in halogen bonding, giving rise to interactions whose strength is close to strong hydrogen bonding. These results point to a novel design of supramolecular paramagnetic species.