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首页> 外文期刊>Journal of nano research >Electronic Influence of Different beta-Diketonato Ligands on the Electrochemical Behaviour of Tris(beta-Diketonato)M(III) Complexes, M = Cr, Mn and Fe
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Electronic Influence of Different beta-Diketonato Ligands on the Electrochemical Behaviour of Tris(beta-Diketonato)M(III) Complexes, M = Cr, Mn and Fe

机译：不同的β-二酮基配体对Tris（β-二酮基）M（III）配合物（M = Cr，Mn和Fe）的电化学行为的电子影响

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摘要

The reduction of the M-III/M-II metal couple of complexes [Cr(beta-diketonato)3], [Fe(beta-diketonato) 3] and [Mn(beta-diketonato)(3)] is reviewed and compared. The ease of reduction of the M-III/M-II couple of [M(beta-diketonato)(3) complexes increases according to the metal sequence [Cr(beta-diketonato) 3] < [Fe(beta-diketonato)3] < [Mn(beta-diketonato)(3)] (with the most positive reduction potential). Good linear relationships obtained between the reduction potential and different electronic parameters related to the beta-diketonato ligand on these [M-III (beta-diketonato)(3)] complexes, show that the ease of reduction of the M-III/M-II couple increases with decreasing acidic strength (pKa) of the respective beta-diketone ligands. It also increases with increasing total group electronegativity of the R and R' groups on the respective beta-diketonato ligand (RCOCHCOR')(-) of the [M(beta-diketonato)(3)] complexes, (chi(R) +chi(R)'), as well as with an increase in the total Hammett sigma meta constants (sigma(R) + sigma(R)'), and also with increasing value of the Lever ligand electronic parameter (E-L)of ligand (RCOCHCOR')(-).
机译：审查并比较了配合物[Cr（β-diketonato）3]，[Fe（β-diketonato）3]和[Mn（β-diketonato）（3）]的M-III / M-II金属对的还原。 [M（β-diketonato）（3）配合物的M-III / M-II对的还原难度根据金属序列[Cr（β-diketonato）3] <[Fe（β-diketonato）3 ] <[Mn（beta-diketonato）（3）]（还原电位最大）。在这些[M-III（β-diketonato）（3）]配合物上，还原电位与与β-二酮基配体相关的不同电子参数之间获得良好的线性关系，表明还原M-III / M-的容易性II对随着相应的β-二酮配体的酸性强度（pKa）的降低而增加。它也随着[M（beta-diketonato）（3）]络合物的各自β-二酮基配体（RCOCHCOR'）（-）上R和R'基团的总基团电负性的增加而增加（（chi（R）+ chi（R'），以及总Hammett sigma meta常数（sigma（R）+ sigma（R）'）的增加，以及配体的杠杆配体电子参数（EL）值的增加（ RCOCHCOR'）（-）。

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