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Synthesis, Mesomorphism, and Unusual Magnetic Behaviour of Lanthanide Complexes with Perfluorinated Counterions
Author(s) -
Galyametdinov Yury G.,
Haase Wolfgang,
Malykhina Larisa,
Prosvirin Andrey,
Bikchantaev Ildar,
Rakhmatullin Ajdar,
Binnemans Koen
Publication year - 2001
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 - 10.1002/1521-3765(20010105)7:1<99::aid-chem99>3.0.co;2-t
Subject(s) - mesophase , counterion , lanthanide , liquid crystal , alkyl , chemistry , crystallography , anisotropy , luminescence , magnetic susceptibility , materials science , ion , organic chemistry , optics , physics , optoelectronics
Lanthanide complexes of the Schiff base ligand 4‐dodecyloxy‐ N ‐hexadecyl‐2‐hydroxybenzaldimine and with perfluorinated alkyl sulfate counterions were synthesised. All of the metal complexes show a smectic A mesophase. The viscosity of this mesophase is much lower than that of analogous compounds with nitrate or alkyl sulfate counterions. The behaviour of these new highly anisotropic molecular magnetic materials was studied using high‐temperature X‐ray measurements in an external magnetic field and temperature‐dependent magnetic susceptibility measurements. The μ eff ‐versus‐temperature curve is more comparable with those expected for nematic phases than for smectic phases. The luminescence spectrum of a Eu III compound shows that the values of the second rank crystal field parameters are very large. The huge magnetic anisotropy can be related to this strong crystal‐field perturbation.