Binding of alkali metal cations by calix[۴]arene-crown-۶ in methanol a thermodynamic study

Calixarenes represent a particularly significant class of the host molecules in supramolecular chemistry, which are generally made up of phenol units linked via methylene bridges[۱]. Calixarenes are known to be good candidates in metallic cation recognition. Selectivity can be tuned by functionally modifying the preorganized platform defined by the phenolic moieties with a wide range of substituents. Of the many selective functionalisations possible, the introduction of polyether chains, first described by Ungaro and coworkers[۲] in ۱۹۸۳, which are called calixcrowns. Calixcrowns has provided a new family of lipophilic basket bowl known for their considerable interest as selective ion transport agents, notably in the treatment of nuclear waste[۳]. This ligands are capable to form complexes with cations of alkali and alkali-earth cations of metals. In this work we investigated the potential of calix[۴]arenes-crown-۶ ether derivatives in the ability of complexation with some alkali metal cations in methanol at ۲۵ȠC using UV-Vis spectrophotometric technique.

کلیدواژه ها:

Calix[۴]arene-Crown-۶ ، Alkali cations ، Stability constant ، Complexation