NOVEL STRATEGY FOR ASSIGNING HYPERFINE SHIFTS USING PULSED-FIELD GRADIENT HETERONUCLEAR MULTIPLE-BOND CORRELATION SPECTROSCOPY

In an attempt to unambiguously assign all hyperfine shifts, pulsed-fie ld gradient and nongradient H-1-C-13 heteronuclear multiple-bond corre lation (HMBC) maps of the bis(N-methylimidazole) complex of rophenyl)- 10,15,2O-triphenylporphyrinato)iron(III) are acquired. It is demonstra ted for the first time that the use of pulsed-field gradients for cohe rence-transfer selection in combination with H-1 detection is a powerf ul method for obtaining two- and three-bond H-1-C-13 connectivities be tween hyperfine-shifted resonances.