Abstract
The synthesis of a Fe VI complex in an octahedral coordination geometry has been achieved recently by Wieghardt and coworkers. This is only the second hexavalent iron complex known after the tetrahedral ferrate ion, [FeO 4 ] 2- . The synthesis of the new Fe VI complex involves a low temperature photolysis of an Fe IV (N 3 ) precursor which leads to the formation of the Fe VI complex containing a Fe≡ N triple bond. The structural characterization of the Fe VI complex has been achieved by a variety of spectroscopic techniques including Mossbauer spectroscopy and X-ray absorption spectroscopy. Experimentally it is found that the Fe VI complex is diamagnetic. Theoretical calculations reveal that the Fe VI complex has an electronic configuration 3d 2 (S = 0); the d electrons are paired in a d xy orbital.
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