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A series of Ln2 complexes based on 8-hydroxyquinoline derivative: slow magnetization relaxation and photo-luminescent properties

Abstract

The reactions of 2-[(4-bromo-phenylimino)-methyl]-quinolin-8-ol (HL) and Ln(hfac)3∙2H2O (Ln(Ⅲ) = Pr, Gd, Tb, Dy, Ho, Er, Lu; hfac- = 1,1,1,5,5,5-hexafluoroacetylacetonate) precursors lead to the formation of seven lanthanide complexes with the formula of [Ln2(hfac)4L2] (Ln = Pr (1); Gd (2); Tb (3); Dy (4); Ho (5); Er (6); Lu (7)). The X-ray structural analysis shows that complexes 1–7 are phenoxo-bridged dinuclear complexes. The luminescence spectra in methanol solution show that complex 3 exhibits characteristic Tb(Ⅲ) centered luminescence, while complex 7 exhibits emission bands similar to that of the ligand. In addition, the magnetic properties of 2–6 are studied: the maximum value of -ΔSm for complex 2 is 15.00 J K−1 kg−1, while complex 4 shows slow magnetic relaxation behaviour with energy barrier of 4.25 K and the pre-exponential factor of 6.55×10-6 s.

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Publication details

The article was received on 13 Dec 2017, accepted on 12 Feb 2018 and first published on 13 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04942K
Citation: New J. Chem., 2018, Accepted Manuscript
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    A series of Ln2 complexes based on 8-hydroxyquinoline derivative: slow magnetization relaxation and photo-luminescent properties

    X. Chu, H. Zhang, Y. Chang, Y. Nie, J. Cui and H. Gao, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04942K

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