Synthesis and characterisation of new tripodal lanthanide complexes and the investigation of their optical and magnetic properties

Alexander R. Craze, Xin-Da Huang, Isaac Etchells, Li-Min Zheng, Mohan M. Bhadbhade, Christopher E. Marjo, Jack K. Clegg, Evan G. Moore, Maxim Avdeev, Leonard F. Lindoy, Feng Li

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

This paper presents the synthesis of a tripodal ligand (H3L) via the Schiff base condensation of N,N-diethylsalicylaldehyde and tris(2-aminoethyl)amine. The neutral complexes of type [EuL], [GdL] and [DyL] were synthesized and characterized by FT-IR, SEM-EDS, PXRD, single crystal X-ray diffraction, CHN analysis and high resolution ESI-MS. X-ray crystallographic studies demonstrated that the heptadentate ligand incorporating a cavity pre-organized by hydrogen bonding binds the Ln(iii) ions to yield a face capped octahedral coordination geometry with three-fold symmetry. Photoluminescence studies show a typical Ln(iii) absorption character for the three complexes, with [EuL] demonstrating considerably stronger lanthanide-based luminescence peaks, and a Eu(iii) centered luminescence lifetime of 0.144 + 0.01 ms. Temperature/field-dependent DC and temperature/frequency-dependent AC magnetic measurements carried out for the Dy(iii) complex indicated obvious magnetic anisotropy and suggested slow relaxation behaviour with considerable quantum tunnelling of the magnetization contribution.
Original languageEnglish
Pages (from-to)12177-12184
Number of pages8
JournalDalton Transactions
Volume46
Issue number36
DOIs
Publication statusPublished - 2017

Keywords

  • investigations
  • rare earth metals

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