Rare-Earth-Containing Magnetic Liquid Crystals
Koen Binnemans,Yury G. Galyametdinov,Rik Van Deun,Duncan W. Bruce,Simon R. Collinson,Arkadiy Polishchuk,I. G. Bikchantaev,Wolfgang Haase,Andrey V. Prosvirin,L. M. Tinchurina,Igor Litvinov,Ajdar Gubajdullin,Ajdar Rakhmatullin,Koen Uytterhoeven,Luc Van Meervelt +14 more
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TLDR
In this paper, rare earth-containing metallomesogens with 4-alkoxy-N-alkyl-2-hydroxybenzaldimine ligands are reported and the stoichiometry of the complexes is [Ln(LH)(3)(NO3)(3)], where Ln is the trivalent rare earth ion;(Y, La, and Pr to Lu, except Pm) and LH is the Schiff base.Abstract:
Rare-earth-containing metallomesogens with 4-alkoxy-N-alkyl-2-hydroxybenzaldimine ligands are reported. The stoichiometry of the complexes is [Ln(LH)(3)(NO3)(3)], where Ln is the trivalent rare-earth ion;(Y, La, and Pr to Lu, except Pm) and LH is the Schiff base. The Schiff base ligands are in the zwitterionic form and coordinate through the phenolic oxygen only. The three nitrate groups coordinate in a bidentate fashion. The X-ray single-crystal structures of the nonmesogenic homologous complexes [Ln(LH)(3)(NO3)(3)]where Ln = Nd(III), Tb(III), and Dy(III) and LH = CH3OC6H3(2-OH)CH=NC4H9, are described. Although the Schiff base Ligands do not exhibit a mesophase, the metal complexes do (SmA phase). The mesogenic rare-earth complexes were studied by NMR, IR, EPR, magnetic susceptibility measurements, X-ray diffraction,and molecular modeling. The metal complexes in the mesophase have a very large magnetic anisotropy, so that these magnetic liquid crystals can easily be aligned by an external magnetic field.read more
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References
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Nuclear magnetic resonance shifts in solution due to lanthanide ions
TL;DR: In this paper, the pseudocontact contribution to the NMR shifts for lanthanide complexes in solution is derived from the anisotropy in the susceptibility, provided that the molecular geometry is independent of temperature and of the lanthanides ion, the shift should vary as T−2 and in a predicted way from ion to ion.
Journal ArticleDOI
Metallomesogens: Metal Complexes in Organized Fluid Phases
TL;DR: Metallomesogens, metal complexes of organic ligands which exhibit liquid crystalline (mesomorphic) character, combine the variety and range of metal-based coordination chemistry with the extraordinary physical properties exhibited by liquid crystals as discussed by the authors.
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