The new perhalogenated porphyrin 2,3,7,8,12,13,17,18- octabromo-5,10,15,20-tetrakis(trifluoromethyl)porphinatonickel(II) exhibits several striking features, including an extremely ruffled macrocycle with a very short Ni–N distance, an unusually red-shifted optical spectrum, and, surprisingly, hindered rotation of the meso-trifluoromethyl substituents (ΔG‡278 = 47 kJ mol–1).
N. Y. Nelson, C. J. Medforth, D. J. Nurco, K. M. Smith, S. Jia and J. A. Shelnutt, Chem. Commun., 1999, 2071 DOI: 10.1039/A904532E
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