Abstract
The synthesis of calixarene‐based N4O4‐donor ligand H6L, in which two 8‐hydroxyquinoline‐2‐carbaldehyde units are appended via hydrazone‐carbonylmethoxy linkages in a 1,3 arrangement to the lower rim of tert‐butylcalix[4]arene, and its coordination properties towards EuIII are described. The reaction of H6L with Eu(NO3)3·6H2O produced dinuclear complex [Eu2(H3L)2(MeCN)2] (4). The EuIII ions in 4 are well separated from each other (d > 8 Å) and each is coordinated by two tetradentate hydroxyquinoline‐2‐carbaldehyde hydrazone substituents from two triply deprotonated (H3L)3– ligands in a dodecahedral geometry. As a consequence there are no exchange interactions between the EuIII ions, and the magnetic properties are solely associated with thermal population of excited (7F1–7F6) terms. The spin–orbit coupling constant λ is 325.2(4) cm–1. Moreover, H6L was found to extract EuIII and TbIII from aqueous solution at pH 7–8, as established by radiotracing with 160Tb and 152Eu.
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