Kinetic study of base-catalyzed asymmetric nitrogen conversion of cis-folded macrocyclic nickel(II) complex of 1,4,7,11-tetraazacyclotetradecane
作者:Yung-Chan Lin、Chung-Sun Chung、Tarun Kumar Misra
DOI:10.1016/j.ica.2006.02.027
日期:2006.5
Abstract In order to examine the effects of coordinated hydroxide ion and free hydroxide ion in configurational conversion of a tetraamine macrocyclic ligand complex, the kinetic of the cis -to- planar interconversion of cis -[Ni(isocyclam)(H 2 O) 2 ] 2+ (isocyclam = 1,4,7,11-tetraazacyclotetradecane) has been examined spectrophotometrically. All kinetic data have been satisfactorily fitted by the
摘要为了研究配位氢氧根离子和游离氢氧根离子对四胺大环配体配合物构型转化的影响,顺式-[Ni(isocyclam)(H 2 O)2]的顺式向平面相互转化的动力学分光光度法检测了2+(异环烷= 1,4,7,11-四氮杂环十四烷)。所有动力学数据均已通过速率定律令人满意地拟合,R =(k 1 K OH [OH-] 2 + k 2 [OH-])(1 + K OH [OH-])-1(顺式-[Ni( isocyclam)(H 2 O)2] 2+ + [Ni(isocyclam)(OH)] +),其中k 2 =(3.40±0.12)×10 3 dm 3 mol -1 s -1几乎等于k OH在缓冲溶液(低碱性介质)中测定,K OH = 22.7±1.4 dm 3 mol -1在I(离子强度)= 0.10 mol dm -3(NaClO 4 + NaOH)和25.0°C下。速率常数k 2和K OH是离子强