posted on 2020-07-30, 03:44authored byHuangjie Lu, Kariem Diefenbach, Zi-Jian Li, Hongliang Bao, Xiaofeng Guo, Jian-Qiang Wang, Thomas E. Albrecht-Schmitt, Jian Lin
The synthesis of a large family of
heterobimetallic lanthanide copper sulfates was realized via stoichiometric
hydrothermal reactions among Ln2O3, CuO, and
H2SO4, giving rise to four distinct phases,
namely Ln2Cu(SO4)2(OH)4 (Ln = Sm–Ho) (LnCuSO4-1), Ln4Cu(SO4)2(OH)10 (Ln = Tm–Lu) (LnCuSO4-2), LnCu(SO4)(OH)3 (Ln
= Nd–Gd, except Pm) (LnCuSO4-3), and LnCu(SO4)(OH)3 (Ln
= Dy–Lu) (LnCuSO4-4), with completely different topologies. The passage from LnCuSO4-1 and LnCuSO4-3 to LnCuSO4-2 and LnCuSO4-4 across the 4f series, respectively,
can be ascribed to the effect of lanthanide contraction, which progressively
induces shrinking of the Ln–O distance, reduction in the Ln
coordination number, and eventually structural transitions. The incorporation
of identical 3d–4f metal ions into different spin–lattices,
in conjunction with substitution of diverse Ln3+ cations
within the same spin–lattice, gives rise to tunable magnetic
properties varying from ferromagnetic ordering in GdCuSO4-3 and HoCuSO4-4 to antiferromagnetic ordering
in YbCuSO4-4, and
to paramagnetic correlations found in GdCuSO4-1 and YbCuSO4-2.