Self-Assembly Synthesis, Structural Features, and Photophysical Properties of Dilanthanide Complexes Derived from a Novel Amide Type Ligand: Energy Transfer from Tb(III) to Eu(III) in a Heterodinuclea
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- 作者：Cunji Gao ; Alexander M. Kirillov ; Wei Dou ; Xiaoliang Tang ; Liangliang Liu ; Xuhuan Yan ; Yujie Xie ; Peixian Zang ; Weisheng Liu ; Yu Tang
- 刊名：Inorganic Chemistry
- 出版年：2014
- 出版时间：January 21, 2014
- 年：2014
- 卷：53
- 期：2
- 页码：935-942
- 全文大小：441K
- ISSN：1520-510X
文摘
A novel amide type ligand benzyl-N,N-bis[(2鈥?furfurylaminoformyl)phenoxyl)ethyl]-amine (L) has been designed and applied for the self-assembly generation of homodinuclear lanthanide coordination compounds [Ln2(渭2-L)2(NO3)6(EtOH)2] [Ln = Eu (1), Tb (2), and Gd (3)] and a heterodinuclear derivative [EuTb(渭2-L)2(NO3)6(EtOH)2] (4). All the complexes have been characterized by the X-ray single-crystal diffraction analyses. They are isostructural, crystallize in a monoclinic space group P21/c, and form [2 + 2] rectangular macrocycle structures. Compound 4 is the first example of a [2 + 2] rectangular macrocycle heterodinuclear EuTb complex assembled from an amide type ligand. In 4, the discrete 0D dimeric [EuTb(渭2-L)2(NO3)6(EtOH)2] units are extended, via the multiple N鈥揌路路路O hydrogen bonds, into a 2D supramolecular network that has been topologically classified as a uninodal 4-connected underlying net with the sql [Shubnikov tetragonal plane net] topology. The triplet state (3蟺蟺*) of L studied by the Gd(III) complex 3 demonstrated that the ligand beautifully populates Tb(III) emission (桅 = 52%), whereas the corresponding Eu(III) derivative 1 shows weak luminescence efficiency (桅 = 0.7%) because the triplet state of L has a poor match with 5D1 energy level of Eu(III). Furthermore, the photoluminescent properties of heterodinuclear complex 4 have been compared with those of the analogous homodinuclear compounds. The quantum yield and lifetime measurements prove that energy transfer from Tb(III) to Eu(III) is being achieved, namely, that the Tb(III) center is also acting to sensitize the Eu(III) and enhancing Eu(III) emission in 4.