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

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Wang,  G-J
Max Planck Institute for Biological Cybernetics, Max Planck Society;
Research Group MR Neuroimaging Agents, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Wang, G.-J., Wei, Y.-Q., & Wu, K.-C. (2016). Mixed d/f Complexes Zn(H2L)Ln(NO3)3 (Ln = Sm, Tb and Dy): Crystal Structure, Fluorescence and Thermal Stability. Chinese Journal of Structural Chemistry, 35(9), 1383-1390. doi:10.14102/j.cnki.0254-5861.2011-1075.


Cite as: http://hdl.handle.net/21.11116/0000-0000-7980-7
Abstract
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.