| 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 |
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| 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。 |
| 关键词: 双冠醚 电导法 苦味酸盐 萃取 |
| 基金项目: 中国科学院科学基金资助课题 |
| Abstract: 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. |
| Keywords: bis-crown ether conductometry picrate extraction |
| 投稿时间：1988-02-25 |
| 摘要点击次数: 1749 |
| 全文下载次数: 1107 |
| 陆国元,王德粉,匙晓林,胡宏纹.腙型双冠醚对碱金属的配位性能[J].无机化学学报,1989,5(4):72-78. |
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