Ferrocene, Cp2Fe, is quantitatively protonated in a mixture of liquid HF/PF5 to yield [Cp2FeH](PF6), which was characterized by 1H/13C NMR and 57Fe Mössbauer spectroscopy as well as single‐crystal X‐ray diffraction analysis. X‐ray diffraction analysis at 100 K revealed a disordered, iron‐coordinated hydrido ligand, which was unambiguously located by aspherical atom refinement at 100 K, and by analyzing the non‐disordered crystal structure at 30 K, revealing a non‐agostic structure.
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Malischewski et al. (2017) studied this question.
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