Syntheses, structures and luminescent properties of a series of ladder-shaped [Ln₂Sr₃] heterometal-organic frameworks

Yanmei ChenKey Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China

Qian GaoKey Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China

Dandan GaoQinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, China

Derong WangQinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, China

Yahong LiKey Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China;State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, ChinaCorrespondence[email protected]

Wei LiuKey Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China

Wu LiQinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, China

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Abstract

A series of Ln^III–Sr^II heterometallic coordination polymers formulated as [Ln₂Sr₃(pda)₆(H₂O)₁₈]·nH₂O (Ln = Pr-1, n = 14; Nd-2, n = 12; Sm-3, n = 11; Eu-4, n = 11; Gd-5, n = 16; Tb-6, n = 13; Dy-7, n = 13) were synthesized via assembly of Ln(NO₃)₃·6H₂O, SrCl₂·6H₂O, pyridine-2,6-dicarboxylic acid (H₂pda) and imidazole (im) in H₂O/C₂H₅OH solution. Single crystal X-ray diffraction revealed that they are isostructural. All of these complexes possess ladder-shaped 1-D chain structures. The luminescent properties of Sm-3, Eu-4, Gd-5, Tb-6 and Dy-7 have been investigated. The solid-state quantum yields and the lifetimes of Eu-4 and Tb-6 are also studied.

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Acknowledgements

The authors appreciate the financial support from Natural Science Foundation of China (21272167 and 21201127), A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institution, Graduate Education Innovation Project in Jiangsu Province (CXZZ12_0808), and Qinghai Science & Technology Department of China (2011-G-208 and 2011-Z-722).

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