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Magnetic susceptibility and 57Fe Mössbauer spectroscopy of the catalysts. a) Simplified schematic of N2 bonding to transition metals. b,c) Magnetic susceptibility of b) FePPc and c) FeMoPPc. d) Room‐temperature 57Fe Mössbauer spectrum of FeMoPPc. The data (scattered dots) are shown with the best fit (black dash line) and the deconvolutions of two components as indicated by the legend.
