Mechanistic study of the substitution reactions of [Pt(II)(bis(2-pyridylmethyl)amine)H2O](ClO4)2 and [Pt(II)(bis(2-pyridylmethyl)sulfide)H2O](ClO4)2 with azole Nucleophiles. Crystal structure of [Pt(II)(bis(2-pyridylmethyl)sulfide)Cl]ClO4
作者:Slindokuhle V. Nkabinde、Grace Kinunda、Deogratius Jaganyi
DOI:10.1016/j.ica.2017.05.054
日期:2017.9
The substitution kinetics of the complexes [Pt(II)(bis(2-pyridylmethyl)amine)H2O](ClO4)2, Ptdpa and [Pt(II)(bis(2-pyridylmethyl)sulfide)H2O](ClO4)2, Ptdps, with a series of azole nucleophiles: Imidazole (Im), 1-methylimidazole (MIm), 1,2-Dimethylimidazole (DIm), 1,2,4-triazole (Trz) and pyrazole (Pyz), were studied in an aqueous medium at constant ionic strength (0.1 M NaClO4). The substitution of the
摘要[Pt(II)(双(2-吡啶基甲基)胺)H2O](ClO4)2,Ptdpa和[Pt(II)(双(2-吡啶基甲基)硫化物] H2O](ClO4)2的取代动力学Ptdps以及一系列的吡咯亲核试剂:咪唑(Im),1-甲基咪唑(MIm),1,2-二甲基咪唑(DIm),1,2,4-三唑(Trz)和吡唑(Pyz)恒定离子强度(0.1 M NaClO4)的水性介质。使用停止流技术或紫外-可见光谱法,在拟一级反应条件下,根据传入亲核试剂的浓度和温度,研究了吡咯在Pt(II)配合物上配位水配体的取代作用。发现Ptdps比Ptdpa更具反应性(高3个数量级)。所有亲核试剂的二级速率常数k2在0.087±0.005和0.926±0之间。Ptdpa为05 M-1 s-1,Ptdps为146±4到1458±10 M-1 s-1。水配体的取代率取决于σ-给体特征的强度和反式原子对离去基团的π-接受性。观察到的吡咯的反应性趋势遵循趋势,即MIm>