摘要
本文将我们研究18-冠-6及15-冠-5的甲基衍生物与碱金属及碱土金属配位反应的热力学数据加以总结并使之系统化,综合讨论了冠醚的取代基对配位能力的影响,在此基础上提出了计算冠醚配合物稳定常数的经验公式,对一百多个数据进行计算,得到了满意的结果.
The present paper summarized and systematized the thermodynamic data of coordination reaction of methyl derivatives of 18-crown-6 and 15-crown-5 with alkli and alkaline earth metal ions, and give a comprehensive view on the effect of substituting groups on coordination ability of crowns. On the basis of above discussions we presented a empiric formula for calculation of stability constants of crown complexes, it is satisfactory for more than one hundred data of crown complexes. The formula is:
Z = charge of metal ions, D = diameter of ions, J-number of methyl, ????-dielectric constant, C-empiric structural factor,for 18-crown-6 and its derivatives, C=6.5(benzo-derivatives), C= 10(no benzenering); for 15-crown-5 and its derivatives, C=-l(15-crown-5), C=-4.5(benzo-15-crown-5), R(in pm) is effective cavity diameter of crowns R = 273(18-crown-6), R = 263(benzo-18-crown-6), _R = 250(15-crown-5), R = 234(benzo-l 5-crown-5).
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1993年第2期225-232,共8页
Chinese Journal of Inorganic Chemistry
基金
国家教委博士点基金资助课题
关键词
冠醚配合物
碱金属
碱土金属
crown complex alkali metal ion, alkaline earth metal ion stability constant, thermodynamics
