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From Zero-Dimensional to One-Dimensional Chain N-oxide Bridged Compounds With Enhanced Single-Molecule Magnetic Performance

From Zero-Dimensional to One-Dimensional Chain N-oxide Bridged Compounds With Enhanced Single-Molecule Magnetic Performance

Ling Zhang, Peng Chen, Hong-Feng Li, Yong-Mei Tian, Peng-Fei Yan, Wen-Bin Sun

Dalton Trans. 2019 Mar 26;48(13):4324-4332.

PMID: 30860232

Abstract:

A series of dinuclear dysprosium complexes bridged by pyridine-NO ligands with formula [Ln2(BTA)6(pyNO)2] (1Dy, Ln = Dy, 1Y, Ln = Y and 1Gd, Ln = Gd) (BTA = benzoyltrifluoroacetone, pyNO = pyridine-N-oxide) were structurally and magnetically characterized. The X-ray crystallographic analyses of the structures revealed that the NO group serves as the effective bridge to link two Dy(iii) centers and the periphery β-diketonate (BTA) ligands complete the rest of the coordination sphere. The dynamic magnetic measurements revealed that complex 1Dy displayed significant zero-field single-molecule magnetic (SMM) behaviour with 72 K energy barrier and 2.5 K hysteresis temperature. In order to extend this dinuclear system, double N-oxide bridged ligand 4,4'-bpdo(4,4'-bipyridine-N,N'-dioxide) was used, and consequently, a series of one-dimensional chain complexes possessing repeated [Ln2(BTA)6(pyNO)2] units were synthesized with formula [Ln2(BTA)6(4,4'-bpdo)]n·2EtOH (2Dy, Ln = Dy, 2Y, Ln = Y and 2Gd, Ln = Gd). The AC magnetic susceptibility measurements revealed that complex 2Dy exhibited significant zero-field slow magnetic relaxation behavior with a higher effective energy barrier of 87 K and a hysteresis temperature of 3 K than 1Dy albeit the separation between the repeated units is large.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1308878	Dysprosium(III) oxide		1308-87-8	Price

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