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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Electronic coupling in 1,4-(COS)(2)C6H4 linked MM quadruple bonds (M = Mo, W): the influence of S for O substitution
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Electronic coupling in 1,4-(COS)(2)C6H4 linked MM quadruple bonds (M = Mo, W): the influence of S for O substitution

机译:1,4-(COS)(2)C6H4相连的MM四键电子耦合(M = Mo,W):S对O取代的影响

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摘要

Electronic structure calculations employing density functional theory on the compounds [(HCO2)(3)M-2](2)(mu-X-C6H4 - X) where M = Mo and W and - X = - CO2, - COS and - CS2 reveal that the successive substitution of oxygen by sulfur leads to enhanced electronic coupling as evidenced by the increased energy separation of the metal delta orbital combinations which comprise the HOMO and HOMO-1. This enhanced coupling arises principally from a lowering of the LUMO of the X - C6H4 - X bridge which, in turn, increases mixing with the in-phase combination of the M-2 delta orbitals. The compounds [((BuCO2)-C-t)(3)M-2](2)(mu-SOC - C6H4 - COS), where M = Mo and W, have been prepared from the reactions between M-2(O2CBut)(4) and the thiocarboxylic acid 1,4-(COSH)(2)C6H4 in toluene and the observed spectroscopic and electrochemical data indicate stronger electronic coupling of the M-2 centers in comparison to the closely related terephthalate compounds.
机译:使用密度泛函理论对化合物[(HCO2)(3)M-2](2)(mu-X-C6H4-X)进行电子结构计算,其中M = Mo和W,-X =-CO2,-COS和- CS2揭示了用硫连续取代氧导致增强的电子耦合,这由包括HOMO和HOMO-1的金属δ轨道组合的能量分离增加所证明。这种增强的耦合主要是由于X-C6H4-X桥的LUMO降低而引起的,进而降低了与M-2δ轨道同相组合的混合。化合物[((BuCO2)-Ct)(3)M-2](2)(mu-SOC-C6H4-COS),其中M = Mo和W,是由M-2(O2CBut)之间的反应制备的(4)和甲苯中的硫代羧酸1,4-(COSH)(2)C6H4以及观察到的光谱和电化学数据表明,与紧密相关的对苯二甲酸酯化合物相比,M-2中心的电子偶联更强。

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