A series of six calix[4]arene derivatives bearing allyl groups
and/or benzyl groups functionalized at the phenolic oxygen atoms were
synthesized and their cation-binding abilities for silver(I) and thallium(I)
ions were evaluated through solvent extraction experiments. The results showed
that both silver(I) and thallium(I) picrates were readily extracted by the
tetrasubstituted p-t-butylcalixarene derivatives, while no extraction of
sodium or potassium picrates was observed. The high extractability of
thallium(I) picrate by these ligands was independent of the functional groups
present, but the extraction of silver picrate seemed to be dependent on the
conformational rigidity of the calixarene; those locked into the cone
conformation showed the highest extractability for silver picrate.
六种烯丙基和/或苄基酚氧原子官能化的钙[4]炔衍生物系列
和/或苄基在酚氧原子上官能化的钙[4]炔衍生物的系列
通过溶剂萃取实验评估了它们与银(I)和铊(I)离子的阳离子结合能力。
离子的阳离子结合能力进行了评估。结果表明
银(I)和铊(I)吡啶甲酸盐都很容易被
四取代的对叔丁基萼片烯衍生物都很容易萃取出吡啶银(I)和吡啶铊(I)。
钠或钾吡啶甲酸盐。苦味酸铊(I)的高萃取率
这些配体对吡啶铊(I)的高萃取率与存在的官能团无关。
存在的官能团无关,但对吡啶银的萃取似乎取决于
的构象刚度有关;那些锁定为锥形构象的配体对吡啶甲酸铊
构象的钙六烯烃对吡啶银的萃取率最高。