Abstract
The possibility of measuring 57Fe, 13C coupling constants and 13C/12C isotope effects on 57Fe nuclei by ‘pseudo-triple’ and ‘pseudo-quadruple’ resonance experiments using (1H, 57Fe), (1H, 57Fe)-{31P} and (31P, 13C)-{13C,1H} HMQC inverse correlations with Ψ-BIRD or bi-selective pulses is demonstrated. 57Fe, 1H coupling constants in the range of 1–2 Hz were used for the polarization transfer, 1J and 2J 57Fe, 13C coupling constants, their relative signs, and isotopic shifts 1Δ13/12C(57Fe) were determined for the first time in (cyclopentadienyl)iron complexes with 57Fe and 13C in natural isotope abundance.
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