腙型双冠醚对碱金属的配位性能  

COMPLEXATION PROPERTY FOR ALKALI METAL SALTS OF HYDRAZONE TYPE BIS-CROWN ETHERS

作　　者：陆国元[1] 王德粉[1] 匙晓林 胡宏纹[1] 

机构地区：[1]南京大学化学系

出　　处：《无机化学学报》1989年第4期72-78,共7页Chinese Journal of Inorganic Chemistry

基　　金：中国科学院科学基金资助课题

摘　　要：本文报道了五个腙型双冠醚的合成。电导测定结果表明含苯并-15-冠-5单元的双冠醚与四苯基硼酸钾、铷、铯,含苯并-18-冠-6单元的双冠醚与四苯基硼酸铯生成2:1夹心型配合物(冠醚单元:金属离子)。并用这些双冠醚的氯仿溶液萃取苦味酸碱金属盐水溶液,测定了萃取百分率和计算了萃取平衡常数,结果表明腙型双冠醚的萃取能力及选择性优于相应的单冠醚。Five hydrazones containing two benzocrown units were prepared by the reaction of bishydrazines containing pyrimidine, triazine, pyridinc rings and the 4'-formyl bcnzo-15-crown-5, benzo-18-crown-6 ethers with good yields. All these new bis-crown ethers were characterized by elemental analysis, IR, 'HNMR, and MS. The stoichiometry of the complexes formed by the bis-crown ethers with alkali metal cation was determined by elcctroconductivity titration of the ligand with alkali metal tetraphenylborate solutions. The result show that the bis-crown ethers containing benzo-15-crown-5 units formed 2 : 1 (crown ether unitsrmetal ion) sandwich type complexes with potassium, rubidium and cesium ions. But the bis-crown ethers containing benzo-18-crown-6 units only formed 2 : 1 complexes with cesium ion. In addition, extraction were carried out from aqueous alkali metal picrates solution with bis-crown ethers solution in chloroform and extraction equilibrium constants were also evaluated. The results indicate that their extractability and cation-selectivity are more effectively than the corresponding monocyc'ic crown ethers.

关 键 词：碱金属配合物 腙型双冠醚 萃取 

分 类 号：O614.11[理学—无机化学]