The title compound (1, H2L), a new type of complexane chelating agent, was synthesized and the complexation properties were examined by potentiometric method. The successive acid dissociation constants (in pKa unit) were 2.61 (H4L2+), 3.63 (H3L+), 8.20 (H2L) and 8.92 (HL−) at 25.0 °C and μ = 0.10M (KNO3). The conditional stability constants (in log KML unit) for MIIL were <2 (Mg2+), 4.0 (Ca2+), 4.4 (Sr2+) and 3.8 (Ba2+). Interaction with Co2+, Ni2+ and Zn2+ was comparable to the alkaline earth metals. Cu 2+ interacted strongly but in a complicated manner.
合成了一种新型络烷
螯合剂--标题化合物(1,H2L),并通过电位法检测了其络合特性。在 25.0 °C 和 μ = 0.10M (
KNO3)条件下,连续酸解离常数(以 pKa 单位)分别为 2.61 (H4
L2+)、3.63 (H3L+)、8.20 (H2L) 和 8.92 (HL-)。MIIL 的条件稳定常数(对数 KML 单位)分别为 <2(Mg2+)、4.0(Ca2+)、4.4(Sr2+)和 3.8(Ba2+)。与 Co2+、Ni2+ 和 Zn2+ 的相互作用与碱土
金属相当。Cu 2+ 的相互作用强烈,但方式复杂。