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A ?-Phosphido Diiron Dumbbell in Multiple Oxidation States.


ABSTRACT: The reaction of the ferrous complex [LFe(NCMe)2 ](OTf)2 (1), which contains a macrocyclic tetracarbene as ligand (L), with Na(OCP) generates the OCP- -ligated complex [LFe(PCO)(CO)]OTf (2) together with the dinuclear ?-phosphido complex [(LFe)2 P](OTf)3 (3), which features an unprecedented linear Fe-(?-P)-Fe motif and a "naked" P-atom bridge that appears at ?=+1480?ppm in the 31 P?NMR spectrum. 3 exhibits rich redox chemistry, and both the singly and doubly oxidized species 4 and 5 could be isolated and fully characterized. X-ray crystallography, spectroscopic studies, in combination with DFT computations provide a comprehensive electronic structure description and show that the Fe-(?-P)-Fe core is highly covalent and structurally invariant over the series of oxidation states that are formally described as ranging from FeIII FeIII to FeIV FeIV . 3-5 now add a higher homologue set of complexes to the many systems with Fe-(?-O)-Fe and Fe-(?-N)-Fe core structures that are prominent in bioinorganic chemistry and catalysis.

SUBMITTER: Ghosh M 

PROVIDER: S-EPMC6790664 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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A μ-Phosphido Diiron Dumbbell in Multiple Oxidation States.

Ghosh Munmun M   Cramer Hanna H HH   Dechert Sebastian S   Demeshko Serhiy S   John Michael M   Hansmann Max M MM   Ye Shengfa S   Meyer Franc F  

Angewandte Chemie (International ed. in English) 20190823 40


The reaction of the ferrous complex [LFe(NCMe)<sub>2</sub> ](OTf)<sub>2</sub> (1), which contains a macrocyclic tetracarbene as ligand (L), with Na(OCP) generates the OCP<sup>-</sup> -ligated complex [LFe(PCO)(CO)]OTf (2) together with the dinuclear μ-phosphido complex [(LFe)<sub>2</sub> P](OTf)<sub>3</sub> (3), which features an unprecedented linear Fe-(μ-P)-Fe motif and a "naked" P-atom bridge that appears at δ=+1480 ppm in the <sup>31</sup> P NMR spectrum. 3 exhibits rich redox chemistry, and  ...[more]

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