Yang, Xiaoping and Wang, Shiqing and King, Tyler L. and Kerr, Christopher J. and Blanchet, Clement and Svergun, Dmitri and Pal, Robert and Beeby, Andrew and Vadivelu, Jamuna and Brown, Katherine A. and Jones, Richard A. and Zhang, Lijie and Huang, Shaoming (2016) 'Anisotropic lanthanide-based nano-clusters for imaging applications.', Faraday discussions., 191 . pp. 465-479.
We have developed a new class of lanthanide nano-clusters that self-assemble using flexible Schiff base ligands. Cd–Ln and Ni–Ln clusters, [Ln8Cd24(L1)12(OAc)39Cl7(OH)2] (Ln = Nd, Eu), [Eu8Cd24(L1)12(OAc)44], [Ln8Cd24(L2)12(OAc)44] (Ln = Nd, Yb, Sm) and [Nd2Ni4(L3)2(acac)6(NO3)2(OH)2], were constructed using different types of flexible Schiff base ligands. These molecular nano-clusters exhibit anisotropic architectures that differ considerably depending upon the presence of Cd (nano-drum) or Ni (square-like nano-cluster). Structural characterization of the self-assembled particles has been undertaken using crystallography, transmission electron microscopy and small-angle X-ray scattering. Comparison of the metric dimensions of the nano-drums shows a consistency of size using these techniques, suggesting that these molecules may share similar structural features in both solid and solution states. Photophysical properties were studied by excitation of the ligand-centered absorption bands in the solid state and in solution, and using confocal microscopy of microspheres loaded with the compounds. The emissive properties of these compounds vary depending upon the combination of lanthanide and Cd or Ni present in these clusters. The results provide new insights into the construction of novel high-nuclearity nano-clusters and offer a promising foundation for the development of new functional nanomaterials.
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|Publisher Web site:||https://doi.org/10.1039/c6fd00018e|
|Publisher statement:||This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.|
|Date accepted:||31 March 2016|
|Date deposited:||30 June 2017|
|Date of first online publication:||31 March 2016|
|Date first made open access:||No date available|
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