Imidazole heme resonance assignments

In particular, the H NMR spectra of the dichelated proto-hemin cyanide complexes reported by Traylor and Berzinis in 1980, which show eight methyl resonances ranging from 20.4 to 4.8 ppm at 35 °C in DMSO- 4, or from 30.2 to 3.7 ppm at 57 °C in DMF- /7, have been assigned by NOES Y/EXS Y, COSY, ROESY and DQF-COSY techniques and the nodal planes of the single imidazole ligand in the two isomers have been shown to lie at 100° and 170° counterclockwise of the x-axis of the hemes shown in Figure 14, bottom. Isomer... 

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