Citation: Zhaoyang WANG, Chun YANG, Yaoyao Song, Na HAN, Xiaomeng LIU, Qinglun WANG. Lanthanide(Ⅲ) complexes derived from 4′-(2-pyridyl)-2, 2′∶6′, 2″-terpyridine: Crystal structures, fluorescent and magnetic properties[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(8): 1442-1451. doi: 10.11862/CJIC.20240114 shu

Lanthanide(Ⅲ) complexes derived from 4′-(2-pyridyl)-2, 2′∶6′, 2″-terpyridine: Crystal structures, fluorescent and magnetic properties

1.
Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
2.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China

Corresponding author: Chun YANG, ychun@hebut.edu.cn
Received Date: 7 April 2024
Revised Date: 15 July 2024

Figures(6)

Abstract: Five dinuclear complexes [Ln(2-pyterpy)(NO₃)₂(μ-OCH₃)]₂ (Ln-2-pyterpy, Ln=Pr, Sm, Eu, Dy, Er) were synthesized by solvothermal method using 4′-(2-pyridyl)-2, 2′∶6′, 2″-terpyridine (2-pyterpy) as ligand. Single crystal X-ray diffraction analysis showed that complexes Pr-2-pyterpy and Sm-2-pyterpy are isomorphic and crystallize in monoclinic system, space group P2₁ with a=0.956 43(19) nm, b=1.965 4(4) nm, c=1.193 5(2) nm, β=90.41(3)°. Complex Er-2-pyterpy crystallizes in monoclinic system, space group C2/c with a=2.838 8(6) nm, b=1.204 8(2) nm, c=1.520 6(3) nm, β=121.70(3)°. Powder X-ray diffraction results showed that complexes Ln-2-pyterpy (Ln=Eu, Dy) are isomorphic and have the same structure as the reported complexes [Ln(2-pyterpy)(NO₃)₂(μ-OCH₃)]₂ (Ln=Tb, Dy), crystallizing in monoclinic crystal system, space group P2₁/n. The lanthanide contraction effect plays an important role in adjusting the structure of this series of complexes. The solid complexes Ln-2-pyterpy (Ln=Pr, Sm, Eu, Dy) emitted the characteristic fluorescence of Ln(Ⅲ) ions. At 300 K, the χ_MT experimental values of complexes Ln-2-pyterpy (Ln=Pr, Sm, Eu, Dy) were consistent with the theoretical values of two corresponding isolated Ln(Ⅲ) ions. According to the χ_MT experimental value at 2 K, the weak antiferromagnetic and ferromagnetic coupling effects between the Ln(Ⅲ) ions of the complexes Sm-2-pyterpy and Eu-2-pyterpy are transmitted by methoxy-bridge, respectively. CCDC: 2333490, Pr-2-pyterpy; 2333491, Sm-2-pyterpy; 2333483, Er-2-pyterpy.
- lanthanide(Ⅲ) complex,
- terpyridine,
- fluorescent property,
- magnetic property
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