双原子配体与血红素的配位：仅一氧化碳。
Coordination of diatomic ligands to heme: simply CO.
作者信息
Silvernail Nathan J, Noll Bruce C, Schulz Charles E, Scheidt W Robert
机构信息
Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
出版信息
Inorg Chem. 2006 Sep 4;45(18):7050-2. doi: 10.1021/ic0613356.
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) A, much shorter than those of six-coordinate [Fe(OEP)(Im)(CO)], although nu(C-O) is 1944-1948 cm(-1). The six-coordinate species [Fe(OEP)(CO)2] has also been studied. The competition for pi-back-bonding of two CO ligands leads to Fe-C distance of 1.8558(10) A and nu(C-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.
摘要
报道了三种仅以CO作为轴向配体的铁（II）卟啉配合物的合成及其分子结构。两种五配位的[Fe（OEP）（CO）]衍生物的Fe-C键长分别为1.7077（13） Å和1.7140（10） Å，比六配位的[Fe（OEP）（Im）（CO）]的键长短得多，尽管其ν（C-O）为1944 - 1948 cm⁻¹。还对六配位的物种[Fe（OEP）（CO）₂]进行了研究。两个CO配体的π-反馈键合竞争导致Fe-C键长为1.8558（10） Å，且ν（C-O）增加到2021 cm⁻¹。穆斯堡尔谱在4.2 K时的四极分裂常数为0 mm/s，表明具有高电子对称性。
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