null检测 | Chiral six-coordinate Dy( III ) and Tb( III ) complexes of an achiral ligand: structure, fluorescence, and magnetism?-上海棱光技术有限公司

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应用领域	石油/化工
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参考标准	structure, fluorescence, and magnetism?

the lanthanide complexes with weak equatorial and strong axial coordinated donors are apt to exhibit good dynamic magnetic

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Two new chiral six-coordinate lanthanide complexes (1 for Dy and 2 for Tb) have been synthesized using

the achiral flexible ligand H 2 L (2,2’-[1,2-ethanediylbis[(methylimino)methylene]]bis[4,5-dimethylphenol]).

Both complexes crystallize in the chiral P1 group space, and the enantiomers [Zn(L)Cl] 3 Dy·MeOH·0.5H 2 O

(Λ-1), [Zn(L)Cl] 3 Dy·1.5H 2 O (Δ-1), [Zn(L)Cl] 3 Tb·1.5H 2 O (Λ-2) and [Zn(L)Cl] 3 Tb·H 2 O (Δ-2) are isolated in the

reaction. Three [Zn(L)Cl] − anions coordinate to the central lanthanide ion using two phenoxo oxygen

atoms of L 2− , and the lanthanide ion has the coordination geometry of D 3 . Complex 1 exhibits a field-

induced slow magnetization relaxation, which is typical of a single-ion magnet (SIM). Ab initio calculations

on complex 1 and studies on magneto-structural correlationship of six-coordinate Dy( III ) SIMs indicate

that the small energy barrier of complex 1 might be related to the absence of a unique anisotropic axis for

the regular octahedral coordination configuration of Dy( III ) and the high quantum tunneling gap between

the ground states (m J = ±15/2). Complex 2 displays green photofluorescence and triboluminescence.

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