New europium coordination polymers with efficient energy transfer from conjugated tetracarboxylate ligands to Eu3+ ion: Syntheses, structures, luminescence and magnetic properties

Li Feng Wang, Ling Chen Kang, Wen Wei Zhang, Fang Ming Wang, Xiao Ming Ren, Qing Jin Meng

科研成果: 期刊稿件文章同行评审

45 引用 (Scopus)

摘要

Two novel lanthanide coordination polymers, [Eu2(EBTC)(DMF) 5(NO3)2]·DMF (1) and [Eu 2(BBTC)1.5(CH3OH)2(H 2O)2]·7DMF·HNO3 (2) (EBTC 4- = 1,1′-ethynebenzene-3,3′,5,5′-tetracarboxylate; BBTC4- = 1,1′-butadiynebenzene-3,3′,5,5′- tetracarboxylate), were successfully synthesized from conjugated ligands of EBTC4- and BBTC4-. Although the two tetracarboxylate ligands have similar structures, their different rigidity/flexibility results in quite different networks upon complexation. Complex 1 has a two-dimensional (2-D) layered structure with two crystallographically independent Eu 3+ ions, one in a distorted monocapped square-antiprism and the other in a distorted square-antiprism coordination geometry. Complex 2 exhibits a three-dimensional (3-D) porous framework, with one type of Eu3+ in a distorted square-antiprism and the other in a trigondodecahedron environment. Both 1 and 2 emit the intensely red characteristic luminescence of Eu 3+ ion at room temperature, with a long lifetime of up to 1.3 and 0.7 ms, respectively, during which the ligand emission of EBTC4-/ BBTC4- was quenched by the Eu3+ ion, indicating the existence of efficient energy transfer between the conjugated ligand of EBTC4-/BBTC4- and the Eu3+ ion. Thus, both EBTC4- and BBTC4- are ideal ligands with an "antenna" effect for the Eu3+ ion. The two complexes show the single-ion magnetic behaviors of Eu3+ with strong spin-orbit coupling interactions even if there are shorter distances (5.714 Å for 1versus 4.275 and 5.360 Å for 2) between the neighboring Eu3+ ions connected by oxygen atoms of the tetracarboxylates.

源语言英语
页(从-至)9490-9497
页数8
期刊Dalton Transactions
40
37
DOI
出版状态已出版 - 7 10月 2011

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