金属卟啉的热力学稳定性与金属离子性质的关系

Correlations of metalloporphyrins thermodynamic stability with properties of the metalions

相同卟啉配体与不同金属离子形成的配合物其热力学稳定性取决于金属离子的性质。根据金属离子的结构及金属与卟啉的配位模式,作者提出了一个判断金属卟啉稳定性大小的经验关系式,计算了一系列金属离子的稳定系数。稳定系数的大小与实验建立的金属卟啉稳定性的顺序基本一致。并由此得出同价和异价金属卟啉稳定性级别的统一数值标准。

Thermodynamic stability of metallopor-phyrins consisted of a given porphyrin withdifferent metals depends on the properties ofthe metal ions.In this paper,a correlativeformula describing the stability is proposedbased on the structures of metalloporphyrinsand the coordination types of metal ions withporphyrin.A series of“Stability Indexes S_u”has been calculated.The calculated valuescoincide with the observed stability ordersand classes of metalloporphyrins.Therebythe stability of metalloporphyrins with metalions of different and same valence can beevaluated numerically based on the same standard.