Coordination of Diatomic Ligands to Heme: Simply CO
- 12 August 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 45 (18) , 7050-7052
Abstract
The synthesis and molecular structures of three iron(II) porphyrinates with only CO as the axial ligand(s) are reported. Two five-coordinate [Fe(OEP)(CO)] derivatives have Fe−C = 1.7077(13) and 1.7140(10) Å, much shorter than those of six-coordinate [Fe(OEP)(Im)(CO)], although νC-O is 1944−1948 cm-1. The six-coordinate species [Fe(OEP)(CO)2] has also been studied. The competition for π-back-bonding of two CO ligands leads to Fe−C distance of 1.8558(10) Å and νC-O being increased to 2021 cm-1. The Mössbauer spectrum has a quadrupole splitting constant of 0 mm/s at 4.2 K, indicating high electronic symmetry.Keywords
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