Synthesis and Mössbauer Characterization of Octahedral Iron(II) Carbonyl Complexes FeI<sub>2</sub>(CO)<sub>3</sub>L and FeI<sub>2</sub>(CO)<sub>2</sub>L<sub>2</sub>: Developing Models of the [Fe]-H<sub>2</sub>ase Active Site
作者:Bin Li、Tianbiao Liu、Codrina V. Popescu、Andrey Bilko、Marcetta Y. Darensbourg
DOI:10.1021/ic9017882
日期:2009.12.7
A series of mono- and disubstituted complexes, FeI2(CO)(x)L4-x, x = 2 or 3, is conveniently accessed from simple mixing of N-heterocyclic carbenes, phosphines, and aromatic amines with FeI2(CO)(4), first reported by Hieber in 1928. The highly light sensitive complexes yield to crystallization and X-ray diffraction studies for six complexes showing them to be rudimentary structural models of the monoiron hydrogenase, [Fe]-H(2)ase or Hmd, active site in native (Fe-II(CO)(2)) or CO-inhibited (Fe-II(CO)(3)) states. Diatomic ligand (nu(CO)) vibrational and Mossbauer spectroscopies are related to those reported for the Hind active site. The importance of a serial approach for relating such parameters in model compounds to low spin Fe-II in the diverse ligation of enzyme active sites is stressed.