Carbon-13 nuclear magnetic resonance studies on high spin iron(III) porphyrins
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Carbon-13 NMR studies on a series of high spin iron(III) porphyrins, namely tetraphenylporphyrin iron(III) halides [Fe(TPP) X, X=Cl, Br, I] in CDCl3 solution are reported. As expected the13C shifts are found to be an order of magnitude larger than the corresponding proton shifts. The dipolar contribution, which is quite important for the proton NMR, becomes much less significant for the13C shifts. No systematic variation in the13C shift across the series is observed, except for the meso-carbon which shows a small but gradual decrease in going from the chloro to the iodo complex. The13C shift for the various carbon atoms of the porphyrin ligand shows interesting pattern which is discussed in terms of spin delocalisation mechanisms.
KeywordsNuclear magnetic resonance high spin iron(III) porphyrins C-13 shifts
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