Three lanthanide-based complexes involving a tetrathiafulvalene derivative(L)in which the lanthanide ion has a pseudo-D_(4d) symmetry have been reported.One is a dinuclear compound of formula[Dy(hfac)_(3)(L)]_(2)(1)wh...Three lanthanide-based complexes involving a tetrathiafulvalene derivative(L)in which the lanthanide ion has a pseudo-D_(4d) symmetry have been reported.One is a dinuclear compound of formula[Dy(hfac)_(3)(L)]_(2)(1)while the two others are isostructural and described as mononuclear complexes of formulae[Ln(tta)_(3)(L)]·xCH_(2)Cl_(2)(Ln^(Ⅲ)=Dy and x=1.41(2);Yb and x=2(3)).The nuclearity of the species is driven by the nature of the ancillary ligands.Magnetic properties revealed that 1 and 3 behave as single molecule magnets,while 2 does not.The crystal field splitting of the ground multiplet state has been theoretically determined as well as the orientation of the easy axis of the ground MJ state.The results of ab initio calculations are in agreement with the experimental determinations of the anisotropy axis.Irradiation of the lowest-energy charge transfer bands of 3 led to an intense and resolved Yb-centred emission which can be correlated to the magnetic data.Thus 3 can be described as a redox-active luminescent field-induced single-molecule magnet.展开更多
The reaction between the 2-{TTF-fused-1H-benzimidazol-2-yl}pyridine alkylated with either the di-(pyrazol-1-yl)-4-pyridyl(L^(1))or dimethyl-2,2’-bipyridine(L^(2))moiety and 1 equiv.
基金supported by the CNRS,Rennes Métropole,Université de Rennes 1,Région Bretagne,FEDER and Agence Nationale de la Recherche(no.ANR-13-BS07-0022-01)the French GENCI center for high-performance computing resources(project x2015080649).
文摘Three lanthanide-based complexes involving a tetrathiafulvalene derivative(L)in which the lanthanide ion has a pseudo-D_(4d) symmetry have been reported.One is a dinuclear compound of formula[Dy(hfac)_(3)(L)]_(2)(1)while the two others are isostructural and described as mononuclear complexes of formulae[Ln(tta)_(3)(L)]·xCH_(2)Cl_(2)(Ln^(Ⅲ)=Dy and x=1.41(2);Yb and x=2(3)).The nuclearity of the species is driven by the nature of the ancillary ligands.Magnetic properties revealed that 1 and 3 behave as single molecule magnets,while 2 does not.The crystal field splitting of the ground multiplet state has been theoretically determined as well as the orientation of the easy axis of the ground MJ state.The results of ab initio calculations are in agreement with the experimental determinations of the anisotropy axis.Irradiation of the lowest-energy charge transfer bands of 3 led to an intense and resolved Yb-centred emission which can be correlated to the magnetic data.Thus 3 can be described as a redox-active luminescent field-induced single-molecule magnet.
基金supported by Région Bretagne,Rennes Métropole,CNRS,Universitéde Rennes 1 and FEDER.G.F.G.gratefully acknowledges the European Commission through the ERC-AdG 267746 MolNanoMas(project no.267746)the ANR(ANR-13-BS07-0022-01)for financial support.B.L.G.and G.F.G.thank the French GENCI/IDRIS-CINES centre for high-performance computing resources.
文摘The reaction between the 2-{TTF-fused-1H-benzimidazol-2-yl}pyridine alkylated with either the di-(pyrazol-1-yl)-4-pyridyl(L^(1))or dimethyl-2,2’-bipyridine(L^(2))moiety and 1 equiv.
