Linear free energy relationships for Fe(III) complexes with aroylacetanilides

Journal of Inorganic and Nuclear Chemistry Pub Date : 1981-01-01 DOI:10.1016/0022-1902(81)90016-6

Ahmad S. Shawali, Magdi M. Naoum, Nahed F. Abdelfattah

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引用次数: 1

Abstract

Acid dissociation constants (pK_a) of seven substituted benzoylacetanilides 1a-g and the stability constants (log B_n) of their 1:1 and 1:2 Fe(III) chelates were determined spectrophotometrically in 60% by volume ethanol-water mixture at ionic strength of 0.1 and 25°C. The correlations between log B_n and pK_a and Hammett substituent constant (σ) were examined. The relations follow the equations: log B₁ = 9.53−2.86 σ; log B₂ = 16.27−7.07 σ; log B₁ =1.26 pK_a-2.36; and log B₂=3.10 pK_a-13.09. The relations between the stability constants of Fe(III) chelates with the ligands 1a-g and benzoylacetarylamides 2a-g and those reported for Cu(II) chelates with 2a-g are also discussed. The results imply that Fe(III) chelates with the ligands 1a-g are subject to “normal” rather than “structural” substituent effects.

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铁(III)与芳基乙酰苯胺配合物的线性自由能关系

用分光光度法测定了7种取代苯甲酰乙酰苯胺类化合物1a-g的酸解离常数(pKa)及其1:1和1:2 Fe(III)螯合物在离子强度为0.1和25℃时的稳定性常数(log Bn)。考察了ln Bn与pKa和Hammett取代常数(σ)之间的相关性。关系式如下:logb1 = 9.53−2.86 σ;log B2 = 16.27−7.07 σ;log B1 =1.26 pKa-2.36;和log B2=3.10 pKa-13.09。讨论了Fe(III)螯合物与配体1a-g和苯甲酰乙酰酰胺2a-g的稳定性常数与Cu(II)与配体2a-g的稳定性常数之间的关系。结果表明，Fe(III)与配体1a-g的螯合物受到“正常”而不是“结构”取代基的影响。

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Journal of Inorganic and Nuclear Chemistry

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