Synthesis, Structures, and Luminescent Properties of Chloride and Nitrate Ln(III) Complexes Coordinated by tris(Pyrazolyl)methane

We report the synthesis of Ln(3+) nitrate [Ln(Tpm)(NO3)(3)].MeCN (Ln= Yb (1Yb), Eu (1Eu)) and chloride [Yb(Tpm)Cl-3].2MeCN (2Yb), [Eu(Tpm)Cl-2(mu-Cl)] 2 (2Eu) complexes coordinated by neutral tripodal tris(3,5-dimethylpyrazolyl)methane (Tpm). The crystal structures of 1Ln and 2Ln were established by single crystal X-ray diffraction, while for 1Yb high resolution experiment was performed. Nitrate complexes 1Ln are isomorphous and both adopt mononuclear structure. Chloride 2Yb is monomeric, while Eu3+ analogue 2Eu adopts a binuclear structure due to two mu 2-bridging chloride ligands. The typical lanthanide luminescence was observed for europium complexes (1Eu and 2Eu) as well as for terbium and dysprosium analogues ([Ln(Tpm)(NO3)(3)].MeCN, Ln= Tb (1Tb), Dy (1Dy); [Ln(Tpm)Cl-3].2MeCN, Ln= Tb (2Tb), Dy (2Dy)).

Automated summary

In this study, the crystal structures of Ln(3+) nitrate and chloride complexes coordinated by neutral tripodal tris(3,5-dimethylpyrazolyl)methane (Tpm) were reported. The nitrate complexes were mononuclear, while the chloride complexes of europium and ytterbium were binuclear. The europium complexes exhibited typical lanthanide luminescence.