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Four Salamo-type 3d–4f hetero-bimetallic [ZnIILnIII] complexes: syntheses, crystal structures, and luminescent and magnetic properties

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Abstract

Four hetero-bimetallic [ZnIILnIII] complexes with the general formula [Zn(L)(OAc)Ln(NO3)2] (Ln = Sm, Eu, Tb and Dy) were synthesized by the Salamo-type ligand H2L (6,6′-diethoxy-2,2′-[1,2-ethylenedioxybis(nitrilomethylidyne)]diphenol) with Zn(OAc)2·2H2O and Ln(NO3)3·6H2O (Ln = Sm, Eu, Tb and Dy), respectively. X-ray crystal diffraction analyses revealed that all the Zn(II) atoms were penta-coordinated, adopting distorted square pyramidal geometries, and the Ln(III) atoms were nona-coordinated, forming distorted tricapped trigonal prism geometries. In addition, three-dimensional supramolecular structures were assembled through intermolecular hydrogen-bond interactions. In the [ZnIILnIII] complexes, only [Zn(L)(OAc)Sm(NO3)2] showed obvious orange-red light emission under UV light due to the characteristic f–f transitions of Sm3+ ions, which meant that the ligand H2L could transfer energy from its excited state to the lowest excited state of the Sm3+ ion effectively. A decrease in the χMT value illustrated weak antiferromagnetic interaction exciting in the [Zn(L)(OAc)Tb(NO3)2] and [Zn(L)(OAc)Dy(NO3)2] complexes.

Graphical abstract: Four Salamo-type 3d–4f hetero-bimetallic [ZnIILnIII] complexes: syntheses, crystal structures, and luminescent and magnetic properties

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Publication details

The article was received on 10 Jan 2017, accepted on 09 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C6NJ04090J
Citation: New J. Chem., 2017, Advance Article
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    Four Salamo-type 3d–4f hetero-bimetallic [ZnIILnIII] complexes: syntheses, crystal structures, and luminescent and magnetic properties

    S. Zheng, W. Dong, Y. Zhang, L. Chen and Y. Ding, New J. Chem., 2017, Advance Article , DOI: 10.1039/C6NJ04090J

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