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首页> 外文期刊>New Journal of Chemistry >The facile coupling of carbon monochalcogenides to ethenedichalcogenone ligands in binuclear iron carbonyl derivatives: a theoretical study
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The facile coupling of carbon monochalcogenides to ethenedichalcogenone ligands in binuclear iron carbonyl derivatives: a theoretical study

机译:双核羰基铁衍生物中碳单硫属元素化物与乙二烯乙酮配体的轻松偶联:理论研究

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摘要

The lowest energy Fe2(CO)_n(CE)2 structures (E = S, Se, Te; n = 8, 7, 6) do not have separate CE ligands but instead have coupled C2E2 ligands functioning as four to six electron donors to the pair of iron atoms. The exothermicity of such coupling reactions as a function of the chalcogen E increases in the sequence S < Se < Te, However, the monomers Fe(CO)4(CE) are stable species owing to the high activation energies for the coupling reactions. Thus, the thiocarbonyl Fe(CO)4(CS) is a stable experimentally known complex. However, the coupled Fe2(CO)7(C2E2) structures are preferred both thermodynamically and kinetically over isomeric Fe2(CO)7(CE)2 structures with discrete CE ligands. For the CS ligand, the previously optimized lowest energy Fe2(CO)_n(CS)2 structures (n = 7, 6) with discrete CS ligands are now found to lie ~11 kcal mol~(-1) (n = 7) and ~30 kcal mol~(-1) (n = 6} in energy above the lowest energy isomeric Fe2(CO)_n(C2S2) structures with coupled C2E2 ligands.
机译:最低能量的Fe2(CO)_n(CE)2结构(E = S,Se,Te; n = 8、7、6)没有单独的CE配体,而是具有耦合的C2E2配体,起着4至6个电子给体的作用这对铁原子。这样的偶联反应根据硫族元素E的放热以S <Se <Te的顺序增加,但是,由于偶联反应的高活化能,所以单体Fe(CO)4(CE)是稳定的。因此,硫代羰基Fe(CO)4(CS)是稳定的实验已知络合物。然而,与具有离散的CE配体的异构Fe 2(CO)7(CE)2结构相比,在热力学和动力学上均优选偶联的Fe 2(CO)7(C2E2)结构。对于CS配体,现在发现具有离散CS配体的先前优化的最低能量Fe2(CO)_n(CS)2结构(n = 7,6)位于〜11 kcal mol〜(-1)(n = 7)和〜30 kcal mol〜(-1)(n = 6},其能量高于具有耦合的C2E2配体的最低能量异构Fe2(CO)_n(C2S2)结构。

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