elevation in the temperature. The Arrhenius plot showed a convex curve at the whole temperatures 20–55°C, and negative ΔH# values for the reactions were obtained at 40–55°C. The Hammett plots at the temperature ranges 20–35° and 40–55°C exhibited good straight lines with ρ values of 1.44–0.73 and 1.18–1.25, respectively. The proposed mechanism is a nucleophilic aromatic substitution‐like, in which the
[1-芳基乙二叉基-双(二
硫代
氨基甲酸甲酯)NN'SS'(-2)] Ni(II)配合物是通过芳基
乙二醛与二
硫代
氨基甲酸甲酯缩合反应制得的。
镍(II)与这些酸盐的螯合得到方形的平面Ni络合物。该ķ 3个为的取代值 SCH 3,发现靠近芳基在吗啉的苯(
钼),接着后35℃的突然下降到稳定增加(20-35℃)。通过进一步升高温度,观察到k 3值连续降低。Arrhenius图在整个温度20–55°C下显示出凸曲线,并且ΔH #为负反应值在40–55°C下获得。在20–35°C和40–55°C温度范围内的哈米特图显示出良好的直线,ρ值分别为1.44–0.73和1.18–1.25。拟议的机制是亲核芳香取代样,其中决定速率的步骤是在20–35°C温度范围内的质子转移过程,而在40–55°C温度范围内的机理则是通过Mo的攻击带有SCH 3基团的碳,然后在Ni上添加第二个Mo分子以形成中间体,该中间体经过Mo和CH