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Structures and Luminescent Properties of Three Heterotrimetallic Ln(Ⅲ)-Sr(Ⅱ)-K(Ⅰ) Complexes |
Author Name | Affiliation | E-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 | |
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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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