Abstract
Two lanthanide-based frameworks: {Ln(phen)(NDA)1.5(H2O)}n (Ln=Gd(1), NDA=2,6-naphthalenedicarboxylate anion, phen=1,10-phenanthroline), and {[Dy(phen)(NDA)1.5]·0.5H2NDA}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 2K, 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/kB=29K and the pre-exponential factor τ0=4.47×10−7s at 2000Oe field; and when the dc field was in 5000Oe, giving ΔE/kB=40K and τ0=2.82×10−6.
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