Carbon-13 nuclear magnetic resonance studies on high spin iron(III) porphyrins
- 17 Downloads
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
Unable to display preview. Download preview PDF.
- Behere D V and Mitra S 1980Indian J. Chem. A 19 505Google Scholar
- Behere D V, Birdy R and Mitra S 1982Inorg. Chem. 21 Google Scholar
- Carrington A and McLachlan A D 1967Introduction to magnetic resonance (New York: Harper and Row) p. 82, 94Google Scholar
- Goff H M 1978Biochim. Biophys. Acta 57 336Google Scholar
- Horrocks W Dew (Jr) 1973 InNMR of paramagnetic molecules (eds) G N LaMar, R H Holm and W Dew Horrocks (New York: Academic Press) Chap. 4Google Scholar
- LaMar G N 1973 InNMR of paramagnetic molecules (eds) G N Lamar, W Dew Horrocks and R H Holm (New York: Academic Press) Chap. 3Google Scholar
- LaMar G N and Walker F Ann 1979 inThe porphyrins (ed) D H Dolphin (New York: Academic Press) Vol.4, p. 61Google Scholar
- Mispelter J, Momenteau M and Ihoste J M 1979J. Chem. Soc. Chem. Comm. p. 808Google Scholar
- Mispelter J, Momenteau M and Ihoste J M 1981J. Chem. Soc. Dalton p. 1729Google Scholar
- Mitra S 1977Progr. Inorg. Chem. 22 307Google Scholar