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• W1968788897 abstract "New mixed-valence iron–nickel dithiolates are described that exhibit structures similar to those of mixed-valence diiron dithiolates. The interaction of tricarbonyl salt [(dppe)Ni(pdt)Fe(CO)3]BF4 ([1]BF4, where dppe = Ph2PCH2CH2PPh2 and pdt2– = −SCH2CH2CH2S−) with P-donor ligands (L) afforded the substituted derivatives [(dppe)Ni(pdt)Fe(CO)2L]BF4 incorporating L = PHCy2 ([1a]BF4), PPh(NEt2)2 ([1b]BF4), P(NMe2)3 ([1c]BF4), P(i-Pr)3 ([1d]BF4), and PCy3 ([1e]BF4). The related precursor [(dcpe)Ni(pdt)Fe(CO)3]BF4 ([2]BF4, where dcpe = Cy2PCH2CH2PCy2) gave the more electron-rich family of compounds [(dcpe)Ni(pdt)Fe(CO)2L]BF4 for L = PPh2(2-pyridyl) ([2a]BF4), PPh3 ([2b]BF4), and PCy3 ([2c]BF4). For bulky and strongly basic monophosphorus ligands, the salts feature distorted coordination geometries at iron: crystallographic analyses of [1e]BF4 and [2c]BF4 showed that they adopt “rotated” FeI centers, in which PCy3 occupies a basal site and one CO ligand partially bridges the Ni and Fe centers. Like the undistorted mixed-valence derivatives, members of the new class of complexes are described as NiIIFeI (S = 1/2) systems according to electron paramagnetic resonance spectroscopy, although with attenuated 31P hyperfine interactions. Density functional theory calculations using the BP86, B3LYP, and PBE0 exchange-correlation functionals agree with the structural and spectroscopic data, suggesting that the spin for [1e]+ is mostly localized in a FeI-centered d(z2) orbital, orthogonal to the Fe–P bond. The PCy3 complexes, rare examples of species featuring “rotated” Fe centers, both structurally and spectroscopically incorporate features from homobimetallic mixed-valence diiron dithiolates. Also, when the NiS2Fe core of the [NiFe]-hydrogenase active site is reproduced, the “hybrid models” incorporate key features of the two major classes of hydrogenase. Furthermore, cyclic voltammetry experiments suggest that the highly basic phosphine ligands enable a second oxidation corresponding to the couple [(dxpe)Ni(pdt)Fe(CO)2L]+/2+. The resulting unsaturated 32e– dications represent the closest approach to modeling the highly electrophilic Ni–SIa state. In the case of L = PPh2 (2-pyridyl), chelation of this ligand accompanies the second oxidation." @default.
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• W1968788897 date "2012-07-27" @default.
• W1968788897 modified "2023-10-16" @default.
• W1968788897 title "Connecting [NiFe]- and [FeFe]-Hydrogenases: Mixed-Valence Nickel–Iron Dithiolates with Rotated Structures" @default.
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• W1968788897 doi "https://doi.org/10.1021/ic300910r" @default.
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