Issue 18, 2013

Structures, luminescence, and slow magnetic relaxation of eight 3D lanthanide–organic frameworks

Abstract

Eight three-dimensional lanthanide–organic frameworks: [Ln(BPDC)1.5(DMF)(H2O)2]·2H2O (Ln = Eu (1), Gd (2), Tb (3), Dy (4); BPDC = 4,4′-dicarboxylate-2,2′-dipyridine anion), [Ln(BPDC)(DMF)2(NO3)] (Ln = Eu (5), Gd (6), Tb (7), Dy (8)) were fabricated and structurally characterized. Compounds 1–4 are isostructural, belonging to the triclinic system with space group P[1 with combining macron], while compounds 6–8 belong to the monoclinic system with space group C2/c. Structural differences between two types of compounds may be caused by different reaction conditions. Magnetic properties of 2–4 and 6–8 have been investigated and only compounds 4 and 8 display significant frequency-dependence, albeit without reaching the characteristic maxima above 2 K, implying slow magnetic relaxation behaviors in 4 and 8. After the application of a DC field, good peak shapes of AC signal were obtained and got the energy barrier for 4, ΔE/kB = 79.80 K and the pre-exponential factor τ0 = 1.28 × 10−10 s, for 8, ΔE/kB = 38.15 K and τ0 = 2.47 × 10−9 s. Geometrical differences in the crystal fields of Dy3+ in 4 and 8 seem to be responsible for the large divergence of their magnetic behaviors. Luminescence analyses were performed on coordination polymers containing Eu3+, Tb3+, and Dy3+, which exhibit the characteristic transitions of corresponding lanthanide ions, and give the lifetime (τ0) of 1, 3, 4, 5, 7 and 8 are 0.56 ms, 0.89 ms, 8.48 μs, 0.60 ms, 0.75 ms and 36.35 μs, respectively.

Graphical abstract: Structures, luminescence, and slow magnetic relaxation of eight 3D lanthanide–organic frameworks

Supplementary files

Article information

Article type
Paper
Submitted
29 Nov 2012
Accepted
12 Feb 2013
First published
13 Feb 2013

Dalton Trans., 2013,42, 6553-6563

Structures, luminescence, and slow magnetic relaxation of eight 3D lanthanide–organic frameworks

M. Fang, J. Li, P. Shi, B. Zhao and P. Cheng, Dalton Trans., 2013, 42, 6553 DOI: 10.1039/C3DT32861A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements