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Title: Ferromagnetic interactions and slow magnetic relaxation behaviors of two lanthanide coordination polymers bridged by 2,6-naphthalenedicarboxylate ligand

Two lanthanide-based frameworks: (Ln(phen)(NDA){sub 1.5}(H{sub 2}O)){sub n} (Ln=Gd(1), NDA=2,6-naphthalenedicarboxylate anion, phen=1,10-phenanthroline), and ([Dy(phen)(NDA){sub 1.5}]·0.5H{sub 2}NDA){sub n} (2) were structurally and magnetically characterized. Compound 1 exhibits 2D layer structure, belonging to the triclinic system with space group P−1, while compound 2 features a 3D framework with space group P−1. The magnetic studies revealed that ferromagnetic coupling existed between adjacent lanthanide ions in 1 and 2, and frequency-dependence out-of-phase signals in the measurement of alternate-current susceptibilities were observed for 2, albeit without reaching the characteristic maxima above 2 K, implying slow magnetic relaxation behavior in 2. After the application of a dc field, good peak shapes of ac signal were obtained and got the energy barrier ΔE/k{sub B}=29 K and the pre-exponential factor τ{sub 0}=4.47×10{sup −7} s at 2000 Oe field; and when the dc field was in 5000 Oe, giving ΔE/k{sub B}=40 K and τ{sub 0}=2.82×10{sup −6}. - Graphical abstract: Two novel lanthanide-based frameworks 1 and 2 were structurally and magnetically characterized. The results revealed that ferromagnetic coupling exists between adjacent lanthanide ions in 1 and 2, and 2 displayed slow magnetic relaxation behavior with the energy barrier of 29 K. - Highlights: • Two lanthanide frameworks were synthesized and magneticallymore » characterized. • The magnetism studies indicate slow magnetic relaxation behavior in 2. • Weak ferromagnetic coupling existing between adjacent lanthanide centers.« less
Authors:
 [1] ;  [2] ;  [3] ;  [3]
  1. Department of Chemistry, Hebei Normal University of Science & Technology, Qinhuangdao 066004, Hebei Province (China)
  2. Department of Chemistry, Chifeng College, Inner Mongolia (China)
  3. Department of Chemistry, and Key Laboratory of Advanced Energy Material Chemistry, Ministry of Education, Nankai University, Tianjin 300071 (China)
Publication Date:
OSTI Identifier:
22475547
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 223; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANIONS; CARBOXYLATION; COORDINATION NUMBER; COUPLING; FREQUENCY DEPENDENCE; HYDRATES; LAYERS; LIGANDS; MAGNETIC PROPERTIES; MAGNETISM; NAPHTHALENE; ORGANIC POLYMERS; PHENANTHROLINES; RARE EARTH COMPLEXES; RARE EARTHS; RELAXATION