期刊
CRYSTAL GROWTH & DESIGN
卷 20, 期 8, 页码 5294-5301出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.0c00522
关键词
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资金
- NSFC [91856124, 21531005, 21421001]
- Nature Science Fund of Tianjin, China [19JCZDJC37200]
- State Key Laboratory of Catalytic Materials and Reaction Engineering (RIPP, SINOPEC)
Two nanosize lanthanide clusters Na-3[EU48O6(OH)(84)(tCa)(34)(gly)(12)(H2O)(22)]center dot 2Htca center dot 6Cl center dot 6H(2)O center dot NO3(Eu-48) and Na[Tb48O6(OH)(84)(fca)(26)(dmp)(14)(H2O)(24)]center dot 4Hfca center dot NO3 center dot 8Cl (Tb-48) have been isolated in the presence of the monodentate carboxylic acid and tridentate chelate ligands under solvothermal condition. Single-crystal X-ray diffraction analyses indicate that Eu-48 and Tb-48 feature a nanopillar structure constructed by [Ln(3)(mu(3)-OH)(4)] and [Ln(5)(mu(4)-O)(mu(3)-OH)(8)] building blocks. In the cavity of the nanopillar, two kinds of anion templates, i.e., NO3- and Cl-, exist, which connect with the nanopillar by hydrogen bond interactions. As the hitherto highest-nuclearity Eu and Tb clusters, the solid-state photoluminescence properties of Eu-48 (lambda(Ex) = 365 nm) and Tb-48 (lambda(Ex) = 370 nm) display dual emission from the characteristic emissions of Eu3+ and Tb3+ ions and weak ligand emissions. Nevertheless, the Eu3+-centered emission was shown under 395 nm excitation with no discernible ligand emission. Moreover, the luminescence properties of Eu-48 and Tb-48 display a response to temperature. With the temperature lowering, the emission peak intensities gradually increase, and good linker relations exist in the range of 118-298 K. This work provides a reference for choosing suitable ligands to synthesize the high-nuclearity luminescent lanthanide nanoclusters.
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