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本文报道了一氧化氮在水溶液中与Fe~Ⅱ(NTMP),Fe~Ⅱ(EDTMP),Fe~Ⅱ(TTHA)_(1/2),Fe~Ⅱ(DTPA).Fe~Ⅱ(CyDTA)和Fe~Ⅱ(EGTA)配位的研究.此处NTMP=氨基三甲叉膦酸,EDTMP=乙二胺四甲叉膦酸,TTHA=三乙四胺六乙酸,DTPA=二乙三胺五乙酸,CyDTA=反式-1,2-二胺六环四乙酸,EGTA=乙二醇二乙醚二胺四乙酸.测定了前四个体系的平衡常数、焓变和熵变,这些亚硝酰配合物稳定性的顺序如下:Fe~Ⅱ(NTMP)(NO)>Fe~Ⅱ(EDTMP)(NO)>Fe~Ⅱ(TTHA)_(1/2)(NO)>Fe~Ⅱ(DTPA)(NO):后两个体系所生成的亚硝酰配合物的稳定性更低.稳定性随温度升高而降低.pH值和螯合剂浓度对配位反应有影响.螯合物Fe~Ⅱ(L)_m的稳定性与亚硝酰螯合物Fe~Ⅱ(L)_m(NO)的稳定性之间没有简单的相关性.
In this paper, the effects of nitric oxide on the activity of Fe ~ Ⅱ (NTMP), Fe ~ Ⅱ (EDTMP), Fe ~ Ⅱ (TTHA) And Fe ~ Ⅱ (EGTA), where NTMP = aminotrimethylenephosphonic acid, EDTMP = ethylenediaminetetramethylenephosphonic acid, TTHA = triethylenetetraminehexaacetic acid, DTPA = diethylenetriaminepentaacetic acid , CyDTA = trans-1,2-diamine hexacyclic tetraacetic acid, EGTA = ethylene glycol diethyl ether diaminetetraacetic acid, the equilibrium constants, enthalpy and entropy change of the first four systems were determined. These nitrosyl complexes The order of stability was as follows: Fe ~ Ⅱ (NTMP) (NO)> Fe ~ Ⅱ (EDTMP) (NO)> Fe ~ Ⅱ (TTHA) _ (1/2) NO): The stability of the nitrosyl complexes formed by the latter two systems is lower, the stability decreases with increasing temperature, the pH value and chelating agent concentration have an effect on the coordination reaction. L) _m and the stability of the nitrosyl chelate Fe ~ Ⅱ (L) _m (NO) has no simple correlation.