Abstract
New lanthanide(III) compounds [[Ln(tepa)(Cl)]-[Ln(tepa)(OH)]2(SbSe4)2] n (Ln=Sm, Eu), [H2tepa][[Ln(tepa)(SbSe4)]2(OH)2] (Ln=Eu, Gd, Ho) (tepa=tetraethylenepentamine) were prepared by solvothermal methods. Acting as a bidentate μ-1κ:2κ-SbSe4 bridging ligand, the [SbSe4]3− unit interconnects [[Ln(tepa)]2(OH)2]4+ and [Ln(tepa)Cl]2+ (Ln=Sm, Eu) ions to form one-dimensional coordination polymers [[Ln(tepa)(Cl)][Ln(tepa)(OH)]2(SbSe4)2] n . The [SbSe4]3− unit acts as monodentate ligand to Ln(III) centers in [H2tepa][[Ln(tepa)(SbSe4)]2(OH)2]. The different coordination modes of the [SbSe4]3− units in [[Ln(tepa)(Cl)][Ln(tepa)(OH)]2(SbSe4)2] n and [H2tepa][[Ln(tepa)(SbSe4)]2(OH)2] are attributed to the size of Ln3+ ions. The bidentate μ-1κ:2κ-SbSe4 bridging ligand in [[Ln(tepa)(Cl)][Ln(tepa)(OH)]2(SbSe4)2] n is observed in the lanthanide complexes of tetraselenidoantimonate ligands for the first time. All compounds exhibit steep band gaps between 2.04 and 2.31 eV at room temperature.
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This work was supported by the National Natural Science Foundation of China (Grant No. 21171123), and the project funded by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.
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Sun, P., Liu, S., Han, J. et al. Solvothermal syntheses, crystal structures, and properties of new lanthanide compounds based on tetraselenidoantimonate and tetraethylenepentamine mixed ligands. Monatsh Chem 148, 209–216 (2017). https://doi.org/10.1007/s00706-016-1777-8
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DOI: https://doi.org/10.1007/s00706-016-1777-8