Re-investigation of an octanuclear iron-oxo complex supported by 4-tbutyl-pyrazolido ligands.

A re-investigation of the synthesis of a Fe(III)-oxo-(4- t Bu-pyrazolido) complex revealed the presence of dinuclear species, which had confused an earlier investigation of this chemistry. The synthesis and characterization of the octanuclear all-ferric compounds [Fe 8 (μ 4 -O) 4 (μ -4-R-pz) 12 Cl 4 ], R = t Bu (1) and n Bu (2) by spectroscopic (1H NMR, UV–Vis, FTIR, 57Fe-Mössbauer) and electrochemical methods are reported along with the single crystal X-ray structure determination of complex 1. These studies were undertaken in order to correct some erroneous conclusions in a recent publication (Eur. J. Inorg. Chem., 2018 , 4925–4929; Eur. J. Inorg. Chem., 2018 , 4930–4931) regarding compound 1. [ABSTRACT FROM AUTHOR]