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Structures and Luminescent Properties of Three Heterotrimetallic Ln(Ⅲ)-Sr(Ⅱ)-K(Ⅰ) Complexes
Author NameAffiliationE-mail
WANG Hong-Sheng School of Chemistry and Chemical Engineering, Xuchang University, Xuchang, Henan 461000, China
Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education), Nankai University, Tianjin 300071, China 
xcuwaller@163.com 
LI Gong-Chun School of Chemistry and Chemical Engineering, Xuchang University, Xuchang, Henan 461000, China  
WU Yan-Chao School of Chemistry and Chemical Engineering, Xuchang University, Xuchang, Henan 461000, China  
ZHANG Wan-Qiang School of Chemistry and Chemical Engineering, Xuchang University, Xuchang, Henan 461000, China  
CHENG Xin-Hua School of Chemistry and Chemical Engineering, Xuchang University, Xuchang, Henan 461000, China  
Abstract: Three coordination polymers with the molecular formula[LnSrK(ptc)2(H2O)]n (Ln=Sm (1), Dy (2), Gd (3), H3ptc=2,4,6-pyridinetricarboxylic acid) were synthesized by hydrothermal reaction of the solutions of Ln(ClO4)3, SrCO3, K2CO3 and H3ptc at 180℃. The structures of three complexes were determined by X-ray single crystal diffraction and the results showed they are isomorphic compounds and crystallize in triclinic system, P1 space group. The ptc ligands bonded with three metal ions Ln (Sm (1), Dy (2) and Gd (3)), Sr, K with two types of coor-dination modes:connecting seven metal ions and connecting eight metal ions. Ln(Ⅲ) is eight-coordinated by six oxygen atoms from carboxyl groups and two nitrogen atoms from two pyridyl rings. Sr(Ⅱ) ion is also eight-coordinated but the coordination atoms are all oxygen atoms. K(Ⅰ) is coordinated by five oxygen atoms. The emission spectra show Sm(Ⅲ)-Sr(Ⅱ)-K(Ⅰ) and Dy(Ⅲ)-Sr(Ⅱ)-K(Ⅰ) complexes both emit the characteristic fluorescence of Sm(Ⅲ) and Dy(Ⅲ). The Gd(Ⅲ)-Sr(Ⅱ)-K(Ⅰ) complex emits green fluorescence but it is resulted from the charge transfer transitions between the ligands and Gd(Ⅲ).
Keywords: 2,4,6-pyridinetricarboxylic acid  rare earth  strontium  potassium  coordination polymer
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WANG Hong-Sheng,LI Gong-Chun,WU Yan-Chao,ZHANG Wan-Qiang,CHENG Xin-Hua.Structures and Luminescent Properties of Three Heterotrimetallic Ln(Ⅲ)-Sr(Ⅱ)-K(Ⅰ) Complexes[J].Chinese Journal of Inorganic Chemistry,2018,34(4):655-661.
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Chinese Journal of Inorganic Chemistry