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Issue 6, 2018
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A series of salen-type asymmetric dinuclear Dy(III) complexes: site-resolved two-step magnetic relaxation process

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Abstract

A series of asymmetric dinuclear dysprosium complexes, namely, [Dy2(L)2(DBM)2(H2O)]·2CH2Cl2 (2), Dy2(L)(DBM)4(H2O) (3), [Dy2(L)(BTFA)4(H2O)]·(Et2O) (4) and Dy2(L)(hmac)4(H2O) (5) (H2L = N,N′-bis(salicylidene)-o-phenylenediamine, DBM = dibenzoylmethane, BTFA = benzoyltrifluoroacetone and hmac = hexamethylacetylacetonate), are structurally and magnetically characterized. Complex 2 is elaborately designed by fine-tuning the local environment of one anisotropic center in a previously studied crystallographically independent {Dy2} SMM (1) displaying a separated two-step relaxation process, and consequently the one-to-one relationship between the spin sites and the relaxation processes is successfully confirmed. In addition, enhanced energy barriers were obtained among complexes 3–5 after introducing highly electron withdrawing groups on β-diketonate ligands. This work sheds light on the source of the complex multiple relaxations and provides a rational design of lanthanide SMMs with improved magnetic properties.

Graphical abstract: A series of salen-type asymmetric dinuclear Dy(iii) complexes: site-resolved two-step magnetic relaxation process

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Publication details

The article was received on 14 Oct 2017, accepted on 23 Dec 2017 and first published on 26 Dec 2017


Article type: Paper
DOI: 10.1039/C7CE01797A
Citation: CrystEngComm, 2018,20, 777-786
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    A series of salen-type asymmetric dinuclear Dy(III) complexes: site-resolved two-step magnetic relaxation process

    W. Zhang, P. Chen, Y. Tian, H. Li, W. Sun and P. Yan, CrystEngComm, 2018, 20, 777
    DOI: 10.1039/C7CE01797A

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