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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。
Copper (Ⅱ) -2,2’-bipyridine-N- (p-substituted phenyl) glycine and copper (Ⅱ) -phenanthroline- N- (para-substituted phenyl) glycine ternary system with the heat of the N- (para-substituted phenyl) amino acid acetate protonation heat with the heat map, you can get two negative slope This not only verifies the linear enthalpy relation in the complex reaction experimentally, but also confirms the authenticity of ΔH_M = Q-βΔH_L and provides some evidences for understanding the nature of coordination bonds. The experimental results show that during the formation of the ternary complex, when the second ligand is complexed with the central ion, the bond between the first ligand and the central ion can be switched over. In addition, we also find that there is also a significant linear entropy relationship between the entropy of entropy and the protonated entropy.