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Iron Pincer Complexes Incorporating Bipyridine: A Strategy for Stabilization of Reactive Species
Organometallics ( IF 2.5 ) Pub Date : 2017-12-01 00:00:00 , DOI: 10.1021/acs.organomet.7b00772
C. Vance Thompson 1 , Ian Davis 1 , Jordan A. DeGayner 2 , Hadi D. Arman 1 , Zachary J. Tonzetich 1
Affiliation  

Treatment of FeCl2(thf)1.5 with the pincer ligand bis(dicyclohexylphosphinomethyl)pyrrolide (CyPNP) in the presence of 2,2′-bipyridine (bipy) affords the six-coordinate complex [FeCl(bipy)(CyPNP)]. The chloride complex exhibits spin-crossover behavior and serves as a starting point for a series of bipy-coordinated iron(II) pincer compounds, including the hydride species [FeH(bipy)(CyPNP)]. Chemical reduction of [FeCl(bipy)(CyPNP)] generates the new complex [Fe(bipy)(CyPNP)], which is found to be consistent with a structure featuring iron(I) as opposed to a bipy radical anion. Reactivity studies with the bipy complexes demonstrate that they are more prone to migratory insertion and β-hydrogen elimination reactions than the corresponding dicarbonyl analogues and that in certain instances the bipy ligand can be sequestered by treatment with a Lewis acid. These observations demonstrate that coordination of bipyridine to pincer-ligated iron(II) species provides a means of stabilizing otherwise unstable compounds while permitting a higher degree of reactivity than is possible with carbonyl coligands.

中文翻译:

结合联吡啶的铁钳复合物:稳定反应物种的策略。

在2,2'-联吡啶(bipy)存在下,用钳位配体双(二环己基膦酰基甲基)吡咯化物(Cy PNP)处理FeCl 2(thf)1.5,得到六配位络合物[FeCl(bipy)(Cy PNP)] 。氯化物配合物表现出自旋交联的行为,并作为一系列Bipy配位的铁(II)钳形化合物的起点,包括氢化物[FeH(bipy)(Cy PNP)]。化学还原[FeCl(bipy)(Cy PNP)]生成新的络合物[Fe(bipy)(CyPNP)],发现与铁(I)的结构(与Bipy自由基阴离子相反)一致。对联吡啶配合物的反应性研究表明,与相应的二羰基类似物相比,联吡啶配合物更容易发生迁移插入和β-氢消除反应,并且在某些情况下,联吡啶配体可以通过路易斯酸进行螯合。这些观察结果表明联吡啶与钳状连接的铁(II)物种的配位提供了稳定原本不稳定的化合物的手段,同时允许比羰基大分子配体更高的反应性。
更新日期:2017-12-01
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