The binding properties of pyrenyl-appended calix[4]arenes 2–4 towards lanthanide and transition metal cations were investigated by spectrophotometric data processing, which indicated that 2 forms mononuclear species with all the cations studied. The extraction power decreased toward ligands 2 – 3 except Co 2+ , then increased for ligand 4 , which reflect the better ability of ligands 2 and 4 to complex and extract at the interface. Derivative 3 formed mono and binuclear species simultaneously with the trivalent cations from La 3+ to Er 3+ but only M 2 L species with Yb 3+ . In the case of 4 , only M 3 L was detected for Yb 3+ and only ML for La 3+ , with the complexation of the other cations tending to form mono-, bi- and tri-nuclear species.

中文翻译：

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芘基连接杯[4]芳烃与镧系元素和过渡金属阳离子的络合性质

通过分光光度数据处理研究了芘附加的杯[4]芳烃 2-4 对镧系元素和过渡金属阳离子的结合特性，这表明 2 与所有研究的阳离子形成单核物质。除 Co 2+ 外，配体 2-3 的萃取能力下降，然后配体 4 的萃取能力增加，这反映了配体 2 和 4 在界面处的更好的络合和萃取能力。衍生物3与从La 3+ 到Er 3+ 的三价阳离子同时形成单核和双核物种，但只有M 2 L物种与Yb 3+ 。在4的情况下，Yb 3+ 仅检测到M 3 L ，La 3+ 仅检测到ML，其他阳离子的络合倾向于形成单核、双核和三核物质。