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Syntheses, Crystal Structures and Luminescent Properties of Ag-Ln Coordination Polymers
Author NameAffiliationE-mail
WANG Yan School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China  
CHEN Fei-Fei School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China  
HU Xiao-Shuang School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China  
ZHAO Ran School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China  
CHI Yu-Xian School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China yxchi@lnnu.edu.cn 
JIN Jing School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China Jinjing_crystal@126.com 
Abstract: Using pyrazine-2-carboxylic acid (2-Hpzc), 3,5-pyridinedicarboxylic acid (3,5-H2PDA) and oxalic acid (H2ox) as ligands, nine Ag-Ln coordination polymers are synthesized by hydrothermal methods:{[LnAg(2-pzc)2(ox)]·H2O}n (Ln=Pr (1), Nd (2), Sm (3), Eu (4)),[LnAg(3,5-PDA)(ox)(H2O)]n (Ln=Pr (5), Nd (6)),[LnAg(3,5-PDA)(3,5-HPDA)(ox)0.5(H2O)2]n (Ln=Sm (7), Dy (8), Ho (9)). All of them possess the 3D network structure, i.e., coordination polymers 1~4 are isomorphic and connected by 2-pzc- and ox2-, while coordination polymers 5~9 use 3,5-PDA2- and ox2- as bridging ligands. Photophysical properties of these coordination polymers are studied, and they show characteristic emissions of corresponding Ln(Ⅲ) ions which should be attributed to the sensitization of the Ag-ligand section (d-block). In addition, under the co-action of crystal field and 4d orbits of Ag(Ⅰ) ion, the 4f orbits of Ln(Ⅲ) ions are tuned and cause obvious shift of partial energy levels, which present shifts of the corresponding NIR emission bands and can be corroborated in their UV-Vis-NIR absorption spectra.
Keywords: Ag-Ln coordination polymer  crystal structure  sensitization  luminescence
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WANG Yan,CHEN Fei-Fei,HU Xiao-Shuang,ZHAO Ran,CHI Yu-Xian,JIN Jing.Syntheses, Crystal Structures and Luminescent Properties of Ag-Ln Coordination Polymers[J].Chinese Journal of Inorganic Chemistry,2019,35(2):225-235.
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Chinese Journal of Inorganic Chemistry