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Oblate versus Prolate Electron Density of Lanthanide Ions: A Design Criterion for Engineering Toroidal Moments? A Case Study on {Ln III 6 } (Ln=Tb, Dy, Ho and Er) Wheels
Author(s) -
Langley Stuart K.,
Vignesh Kuduva R.,
Moubaraki Boujemaa,
Rajaraman Gopalan,
Murray Keith S.
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201805765
Subject(s) - lanthanide , toroid , ion , magnetic moment , electron , ground state , chemistry , prolate spheroid , atomic physics , crystallography , condensed matter physics , physics , nuclear physics , classical mechanics , plasma , organic chemistry
We report four new complexes based on a {Ln III 6 } wheel structure, three of which possess a net toroidal magnetic moment. The four examples consist of {Tb III 6 } and {Ho III 6 } wheels, which are rare examples of non Dy III based complexes possessing a toroidal magnetic ground state, and a {Dy III 6 } complex which improves its toroidal structure upon lowering the crystallographic symmetry from trigonal ( R 3 ‾ ) to triclinic ( P 1 ‾ ). Notably the toroidal moment is lost for the trigonal {Er III 6 } analogue. This suggests the possibility of utilizing the popular concept of oblate and prolate electron density of the ground state M J levels of lanthanide ions to engineer toroidal moments.