Nuclear magnetic resonance porphyrin complexes

Wong, C.-R, Venteicher, R.F., and Horrocks, WD. Jr (1974) Lanthanide porphyrin complexes. Potential new class of nuclear magnetic resonance dipolar probe. Journal of the American Chemical Society, 96, 7149. 

In the early proton nuclear magnetic resonance ( H NMR) studies with the O2 complexes of amide functionalized, basket-handle porphyrins (5, Fig. 2), a pronounced downfield shift of the amide C(0)—NH was observed in apolar solvent, indicating the C(0)—NH 02 hydrogen bonding (14a,16). This hydrogen bond, however, was weak, since the estimated nitrogen-02 distance is 4 A. 

Balch, A.L., R.L. Hart, L. Latos-Grazynski, and TG. Traylor (1990). Nuclear magnetic resonance studies of the formation of tertiary alkyl complexes of iron(lll) porphyrins and their reactions with dioxygen. J. Am. Chem. Soc. 112, 7382-7388. 

Horrocks, W., De, W. Wong, C. P (1976). Lantanide porphyrin complexes evaluation of nuclear magnetic resonance dipolar probe and shift reagent capabilities. J. Am. Chem. Soc, 98(23), 7157-7162. 

---