Citation: WANG Gao-Ji, WEI Yong-Qin, WU Ke-Chen. Mixed d/f Complexes Zn(H₂L)Ln(NO₃)₃(Ln=Sm,Tb and Dy): Crystal Structure,Fluorescence and Thermal Stability[J]. Chinese Journal of Structural Chemistry, ;2016, 35(9): 1383-1390. doi: 10.14102/j.cnki.0254-5861.2011-1075 shu

Mixed d/f Complexes Zn(H₂L)Ln(NO₃)₃(Ln=Sm,Tb and Dy): Crystal Structure,Fluorescence and Thermal Stability

1.
a College of Chemistry, Fuzhou University, Fuzhou 350116, China;
2.
b State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China

Received Date: 2 December 2015
Available Online: 6 April 2016
Fund Project:

A series of isostructural d/f molecular compounds Zn(H₂L) Ln(NO₃)₃·CH₃OH(Ln=Dy(1), Tb(2) and Sm(3)) were synthesized by the introduction of a designed multifunctional ligand N,N',N'',N'''-tetra(2-hydroxy-3-methoxy-5-methylbenzyl)-1,4,7,10-tetraazacyclododecan(H₄L=C₄₄H₆₀N₄O₈). In the isostructural molecules, each crystallographically independent Zn²⁺ and Ln³⁺ centers are connected by two phenolic oxygen atoms. For the six-coordinate Zn²⁺ ion, the coordination geometry can be viewed as a regular bicapped square pyramid. While for the ten-coordinate Ln³⁺ ion, if each O,O'-chelated nitrate ligand is seen as a single coordination site, the coordination geometry can be viewed as a distorted pentagonal bipyramid. The fluorescent spectra show that compounds 2 and 3 exhibited characteristic sharp emissions of Tb³⁺ and Sm³⁺, respectively, while compound 1 was found to be a single-component white-light-emitting complex in the solid state. Thermal stabilities of the three compounds were investigated by using thermal gravimetric analysis. In addition, the thermal decomposition of compound 1 was confirmed by temperature-dependent powder X-ray diffraction technique.
- mixed d/f complex,
- fluorescence,
- white light,
- thermal stability
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