Preparations of trans - and cis - μ -1,2-Peroxodiiron(III) Complexes.

The iron(II) complex with cis,cis -1,3,5-tris(benzylamino)cyclohexane (Bn 3 CY) ( 1 ) has been synthesized and characterized, which reacted with dioxygen to form the peroxo complex 2 in acetone at -60 °C. On the basis of spectroscopic measurements for 2 , it was confirmed that the peroxo complex 2 has a trans - μ -1,2 fashion. Additionally, the peroxo complex 2 was reacted with benzoate anion as a bridging agent to give a peroxo complex 3 . The results of resonance Raman and 1 H-NMR studies supported that the peroxo complex 3 is a cis - μ -1,2-peroxodiiron(III) complex. These spectral features were interpreted by using DFT calculations.