Synthesis and magnetic properties of cerium macrocyclic complexes with tmtaaH2, tetramethyldibenzotetraaza[14]-annulene
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Synthesis and magnetic properties of cerium macrocyclic complexes with tmtaaH2, tetramethyldibenzotetraaza[14]-annulene

  • Author(s): Walter, Marc D.
  • Fandos, Rosa
  • Andersen, Richard A.
  • et al.
Abstract

The complexes [Ce(tmtaa)2], [Ce(tmtaa)(tmtaaH)] and [Ce2(tmtaa)3(thf)2] are obtained from Ce[N(SiMe3)2]3 and tmtaaH2, the macrocyclic ligand 6,8,15,17-tetramethyldibenzotetraaza[14]-annulene, depending on the stoichiometry, solvent and temperature. The crystal structure of Ce(tmtaa)2 is isostructural with Zr(tmtaa)2, however magnetic susceptibility measurements in the range 5-300 K show that Ce(tmtaa)2 is not diamagnetic, but is a temperature-independent paramagnet (TIP), similar to Ce(cot)2, cerocene.

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