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The apparent thermodynamic functions of the protonation and coordination of N,N′-(para-substituted phenol) ethylenediamine with Cu (Ⅱ) has been determined at 25.0±0.1 ℃ and I=0.1 mol.dm~(-3) (NaClO_4) in 90% (V/V) ethanol by the constant temperature environment-continuous titration calorimeter which had been constructed in our laboratory. It has been found that the heat of protonation (H_(L1)) is linearly correlated with the Hammett constants and the formation of H~+ bridge occurs in ~H+ -N, N′-(p-RPh)_2en (1:1) systems. 相似文献
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The heats of protonation of N-(para-substituted phenyl) glycines (R—C_6H_4—NHCH_2COOH, R=CH_3O, CH_3, H, C1) and the heats of formation of these amino acids with copper(Ⅱ) have been determined calorimetrically at 25℃ in 30% (v/v) ethanol in the presence of 0.1M sodium perchlorate. The data obtained conform nicely to the equation △H_(ML)-Q-β△H_(HL) where △H_(ML) denotes the heats of formation of complex compounds, △H_(HL) denotes the heats of protonation of the ligands, and Q and β are constants. 相似文献
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使用RD-1型热导式自动量热计分别测定了铜(Ⅱ)-2,2′-联吡啶-N-(对位取代苯基)氨基乙酸及铜(Ⅱ)-邻菲哕啉-N-(对位取代苯基)氨基乙酸三元体系的配合热,以N-(对位取代苯基)氨基乙酸根的质子化热对配合热作图,可以得到斜率为负的两条相互平行的直线,这不仅再一次从实验上验证了配合反应中的直线焓关系式:ΔH_M=Q-βΔH_L的真实性,而且为了理解配位键的本质提供了一些依据。实验结果表明:在生成三元配合物的过程中,当第二配体与中心离子配合时,会引起第一配体与中心离子间的键能发生改交。此外,还发现在配合熵与质子化熵之间也存在明显的直线熵关系。 相似文献
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