Kinetic, thermodynamic and X-ray crystal studies on N-alkyl-α-amineoxime ligand exchange between planar nickel(II) complexes
作者:Mary A. Brownback、R.Kent Murmann、Charles L. Barnes
DOI:10.1016/s0277-5387(01)00844-0
日期:2001.8
Similar measurements were made for mixed ligand complex formation from the free ligand and the symmetrical complex ion. Using measured and estimated rate constants, the concentration versus time profile for one exchange reaction was simulated using the gepasi method and closely followed the experimental data. With (H, n-propyl) and (H, i-propyl), single crystals of the Ni(II) complexes were isolated as the
已经获得了配合物[Ni(RAO)2 -H] +和[Ni(R'AO)2 -H] +之间的二齿配体交换的平衡和动力学参数,得到了[Ni(RAO)(R'AO)- H] +通过使用反相HPLC色谱法分析水溶液;R = H,Me,Et,n -Pr和n-Bu 发现反应主要是由熵控制的,而主要的速率控制步骤是最强结合的二齿配体的离解。在有机溶剂中,交换反应可能通过相同的基本机理以可比的速率进行。对于由游离配体和对称络合物离子形成的混合配体络合物进行了类似的测量。使用测量和估计的速率常数,使用gepasi方法模拟了一个交换反应的浓度与时间的关系,并密切关注实验数据。与(H,Ñ丙基)和(H,我-丙基),将Ni的单晶(II)配合物,分离得到的溴离子的盐,并通过HPLC,X射线结构解析和鉴定1 H,13 C NMR。比较与相同金属离子配位的同分异构体配体的键距和角度。这些配合物与在两个AO配体上均具有烷基的配合