冠醚化合物的合成——ⅩⅣ.二茂铁硫冠醚的合成及其银离子选择电极的研究

SYNTHESIS OF CROWN ETHER COMPOUNDS ⅪⅤ.FERROCENYLPOLYTHIA-CROWN ETHERS AND THEIR SILVER ION-SELECTIVE ELECTRODES

本文合成了两种类型6个二茂铁硫冠醚1—6,其中4—6是一类新型缩醛硫冠醚。将冠醚2—6作为传感活性物质研制成PVC膜银离子选择电报,其中以用冠醚4的电极性能最佳,对一价和二价干扰离子的选择性,远优于文献结果。

Six of two types ferrocenylpolythia crown ethers(1--6) were prepared by reacting 1,1′-bis(hydroxymethyl) ferrocene or ferrocenccarboxyaldehyde with α,ω-dimercaptan compounds ingood yield.A serics of Ag-ion-selective electrodes based on the crown ethers (2--6) as elec-troactive material were prepared. The electrode with 4 was found to have the best properties.It shows linear response of 1×10^(-1)-3×10^(-5)mol/L AgNO_3 and potentiometric selectivity co-efficients of 10^(-3)and 10^(-4)--10^(-5)for cations of Ⅰand Ⅱ valency respeetively. The selecti-vities of the electrodes for Na^+,Hg^(2+), Mg^(2+) were 44--682 times better than other crownether electrodes reported in literature.