Copper(II)-Lanthanide(III) Complexes of Symmetric Dinucleating Macrocycle with Two Phenolate Bridges

Kazuhiro Manseki, Motoko Kumagai, Masatomi Sakamoto, Hiroshi Sakiyama, Yuzo Nishida, Akira Matsumoto, Yoshihiko Sadaoka, Masaaki Ohba, Hisashi Okawa

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11 Citations (Scopus)


The first heteronuclear copper(II)-lanthanide(III) complexes, CuLn(fsal-2,2)(NO3)3(H2O)n (n = 2 for Ln = Nd and n = 1 for Ln = Eu and Gd), of a symmetric macrocyclic dinucleating Schiff base ligand, H2fsal-2,2, which is a condensation product of two molecules of 2,6-diformyl-4-methylphenol and two molecules of ethylenediamine, were synthesized by the reaction of [N′,N/-bis(3-formyl-5-methylsalicylidene)ethylenediaminato]copper(II) and ethylenediamine in the presence of lanthanide(III) ion as a template, where fsal-2,2 denotes the dianion formed by the deprotonation of two phenolic hydroxyl groups in H2fsal-2,2. The absorption spectra suggested that substrates possessing N- and O-donor groups, such as amino alcohols, are specifically bound at the Cu-Ln center through nitrogen-coordination to the copper site and through oxygen-coordination to the lanthanide site. The fluorescence intensity of Eu(III) decreased drastically upon forming the Cu-Eu complex. A cryomagnetic susceptibility measurement indicated a ferromagnetic spin-spin interaction between Cu(II) and Gd(III) ions.

Original languageEnglish
Pages (from-to)379-383
Number of pages5
JournalBulletin of the Chemical Society of Japan
Issue number2
Publication statusPublished - Feb 1998

All Science Journal Classification (ASJC) codes

  • Chemistry(all)


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