How Innocent are Potentially Redox Non-Innocent Ligands? Electronic Structure and Metal Oxidation States in Iron-PNN Complexes as a Representative Case Study
作者:Burkhard Butschke、Kathlyn L. Fillman、Tatyana Bendikov、Linda J. W. Shimon、Yael Diskin-Posner、Gregory Leitus、Serge I. Gorelsky、Michael L. Neidig、David Milstein
DOI:10.1021/acs.inorgchem.5b00509
日期:2015.5.18
and X-ray photoelectron spectroscopy (XPS) as well as electron paramagnetic resonance (EPR) and magnetic circular dichroism (MCD) spectroscopy, SQUID magnetometry, and X-ray crystallography, focusing on the assignment of the metal oxidation states. Ligand structural features suggest that the α-iminopyridine ligand behaves as a redox non-innocent ligand in some of these complexes, particularly in [Fe(CO)2LPNN]
在这里,我们提出了一系列新的基于α-亚氨基吡啶的铁-PNN钳形配合物[FeBr 2 L PNN ](1),[Fe(CO)2 L PNN ](2),[Fe(CO)2 L PNN ] [ BF 4)(3),[Fe(F)(CO)2 L PNN ](BF 4)(4)和[Fe(H)(CO)2 L PNN ](BF 4)(5)态范围从铁(0)到铁(II)(L PNN = 2 - [(二-叔-丁基膦基)甲基] -6- [1-(2,4,6-间苯二甲酰亚胺基)乙基]吡啶)。配合物的特征在于多种方法,包括1 H,13 C,15 N和31 P NMR,IR,Mössbauer和X射线光电子能谱(XPS)以及电子顺磁共振(EPR)和磁圆二色性(MCD)光谱,SQUID磁力测定法和X射线晶体学,重点是金属氧化态的分配。配体的结构特征表明,α-亚氨基吡啶配体在某些配合物中表现为氧化还原非纯配体,特别是在[Fe(CO)2