Key Laboratory of Functional Inorganic Material Chemistry MOE

China

Key Laboratory of Functional Inorganic Material Chemistry MOE

China
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Niu W.,Key Laboratory of Functional Inorganic Material Chemistry MOE | Niu W.,Heilongjiang University | Yan P.,Key Laboratory of Functional Inorganic Material Chemistry MOE | Yan P.,Heilongjiang University | And 8 more authors.
Science of Advanced Materials | Year: 2016

A series of L-di-toluoyl-tartaric acid lanthanide coordination polymers, namely, ([LnL(HL)(H2O)5 · H2O)n [Ln = La (1), Eu (2), Gd (3) and Tb (4)], ([Eu0.041Tb0.017La0.942L(HL)(H2O)5 · H2O)n (5) and ([Eu0.027Tb0.028 Gd0.945L(HL)(H2O)5 ·H2O)n (6), have been synthesized by facile reactions of H2L (H2L=L-di-toluoyl-tartaric acid) with LnCl3 · 6H2O under ambient temperature. X-ray crystallographic analysis reveals that complexes 1-6 are isomorphic and feature one-dimensional (1D) linear structure in which the Ln3+ ions are bridged by carboxylate groups of ligands. The luminescence spectra in the solid state at room temperature reveal that complexes 2 and 4 exhibit the characteristic red and green luminescence of Eu3+ and Tb3+ ions, respectively. In contrast, complexes 1 and 3 display blue emission of the ligand with a broad band centered at 382 nm. Notably, the mixedlanthanide coordination polymers 5 and 6 exhibit luminescence with emitted color tunable from yellow, white to blue under excitation with variation wavelengths. Our result demonstrate that 1D carboxylic acid mixed-lanthanide coordination polymers allow realizing color-tunable and white-light emission with uniquely long lifetime. © 2016 by American Scientific Publishers All rights reserved.


Pajerowski D.M.,U.S. National Institute of Standards and Technology | Li Q.,Key Laboratory of Functional Inorganic Material Chemistry MOE | Li Q.,Heilongjiang University | Hyun J.,U.S. National Institute of Standards and Technology | And 8 more authors.
Dalton Transactions | Year: 2014

Three chloride-bridged lanthanide compounds, [Ln4Cl 6(CH3OH)12(OH)2] ·4Cl·2CH3OH [Ln = Gd (1), Dy (2) and Er (3)], have been unexpectedly isolated by the reactions of LnCl3·6H 2O and N,N′-bis(salicylidene)-1,2-(phenylene-diamine) (H 2L). X-ray crystallographic analysis reveals a triclinic cell with a unique defect-dicubane {Ln4} core and the structure across this series is nominally isomorphic. Measurements of direct current magnetic susceptibility and isothermal magnetization give insight into the relevant cluster Hamiltonians for 1, 2, and 3, and alternating current susceptibility shows slow relaxation in 2, but not in 1 or 3 down to 2 K and up to 1 kHz. This journal is © the Partner Organisations 2014.


Fei B.,Key Laboratory of Functional Inorganic Material Chemistry MOE | Fei B.,Harbin University | Yan P.,Key Laboratory of Functional Inorganic Material Chemistry MOE | Yan P.,Harbin University | And 6 more authors.
Journal of Luminescence | Year: 2016

A series of five rigid hexadentate salen-type (H2L) erbium complexes, namely, [Er2L(OAc)4(CH3OH)2]·2CH3OH (1), [Er2L3(CH3OH)]·2CH3OH (2), [Er3L3(OAc)3]·3CH3OH·H2O (3), [Er2L(acac)4]·2CH2Cl2 (4) and [Er2LL′L″(CH3OH)(H2O)2](ClO4)2·CH3OH·H2O (5) (H2L = N,N′-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine, HL′=2-(2′-hydroxy-3′-methyloxy-phenyl)-benzimidazole and HL″=3-methoxysalicylaldehyde) have been isolated by reactions of H2L with various Er(III) salts. X-ray crystallographic analyses demonstrate that complexes 1, 2, 4 and 5 possess the unique Er2 core with a ratio of H2L/Er=1:2, 3:2, 1:2 and 1:1, respectively. Complex 3 is trinuclear with sandwich-type structure. All complexes 1-5 exhibit near-IR luminescence of Er(III) ions around 1530 nm with lifetime (2.45 μs), which can be rationalized on the basis of the disparate structural effects. © 2016 Elsevier B.V.

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