Single-Ion Magnetism in a Three-Dimensional Thiocyanate-Bridged Dysprosium(III) Framework.

Autor:	Wan, Qingyun, Arczyński, Mirosław, Wakizaka, Masanori, Gupta, Shraddha, Funakoshi, Nobuto, Yamashita, Masahiro
Předmět:	DYSPROSIUM MAGNETISM RARE earth metals MAGNETIC measurements MAGNETIC relaxation
Zdroj:	Chemistry (2624-8549); Jun2023, Vol. 5 Issue 2, p987-995, 9p
Abstrakt:	New three-dimensional (3D) lanthanide framework compounds supported by bridging thiocyanate ligand and K+ cations, K4[Ln(NCS)4(H2O)4](NCS)3(H2O)2(1: Ln = Dy, 2: Ln = Tb, 3: Ln = Gd) have been synthesized. A single-crystal X-ray diffraction study showed that all three compounds were isostructural and crystallized in the I 2/a space group. The K+ ion form 2D layers with thiocyanates which are further linked by [Ln(NCS)4(H2O)4]- complexes and additional thiocyanate ions to generate an interesting 3D framework structure. Compound 1 shows slow magnetic relaxation behavior under a zero direct current (DC) field, indicating that 1 behaves as a single-ion magnet (SIM). As estimated from AC magnetic measurements, the effective energy barrier for spin reversal in 1 was Ueff = 42 cm–1. Slow relaxation of magnetization under a small external DC field was also detected for 2 and 3 at 1.8 K. [ABSTRACT FROM AUTHOR]
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