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Issue 28, 2017
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Synthesis and interconversions of reduced, alkali–metal supported iron–sulfur–carbonyl complexes

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Abstract

We report the synthesis, interconversions and X-ray structures of a set of [mFe–nS]-type carbonyl clusters (where S = S2−, S22− or RS; m = 2–3; n = 1–2). All of the clusters have been identified and characterized by single crystal X-ray diffraction, IR and 13C NMR. Reduction of the parent neutral dimer [μ2-(SPh)2Fe2(CO)6] (1) with KC8 affords an easily separable ∼1 : 1 mixture of the anionic, dimeric thiolate dimer K[Fe2(SPh)(CO)6(μ-CO)] (2) and the dianionic, sulfido trimer [K(benzo-15-crown-5)2]2[Fe33-S)(CO)9] (3). Oxidation of 2 with diphenyl-disulfide (Ph2S2) cleanly returns the starting material 1. The Ph–S bond in 1 can be cleaved to form sulfide trimer 3. Oxidation of sulfido trimer 3 with [Fc](PF6) in the presence of S8 cleanly affords the all-inorganic persulfide dimer [μ2-(S)2Fe2(CO)6] (4), a thermodynamically stable product. The inverse reactions to form 3 (dianion) from 4 (neutral) were not successful, and other products were obtained. For example, reduction of 4 with KC8 afforded the mixed valence Fe(I)/Fe(II) species [((FeI2S2)(CO)6)2FeII]2− (5), in which the two {Fe2S2(CO)6}2− units serve as bidendate ligands to a Fe(II) center. Another isolated product (THF insoluble portion) was recrystallized in MeCN to afford [K(benzo-15-crown-5)2]2[((Fe2S)(CO)6)2(μ-S)2] (6), in which a persulfide dianion bridges two {2Fe–S} moieties (dimer of dimers). Finally, to close the interconversion loop, we converted the persulfide dimer 4 into the thiolate dimer 1 by reduction with KC8 followed by reaction with the diphenyl iodonium salt [Ph2I](PF6), in modest yield. These reactions underscore the thermodynamic stability of the dimers 1 and 4, as well as the synthetic and crystallization versatility of using the crown/K+ counterion system for obtaining structural information on highly reduced iron–sulfur–carbonyl clusters.

Graphical abstract: Synthesis and interconversions of reduced, alkali–metal supported iron–sulfur–carbonyl complexes

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Publication details

The article was received on 26 Apr 2017, accepted on 22 Jun 2017 and first published on 04 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT01506B
Citation: Dalton Trans., 2017,46, 9163-9171
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    Synthesis and interconversions of reduced, alkali–metal supported iron–sulfur–carbonyl complexes

    J. P. Shupp, A. R. Rose and M. J. Rose, Dalton Trans., 2017, 46, 9163
    DOI: 10.1039/C7DT01506B

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