Syntheses, structures and magnetic properties of a family of one-dimensional M(II)-lanthanide(III) (M = Ni(II) and Zn(II)) coordination polymers

A series of 1D nickel(II)/zinc(II)-lanthanide(III) coordination polymers, [M(μ-L)2Ln(NO3)3]n · solvents (HL = bis(2-pyridylcarbonyl)amine; M = Ni, Ln = Gd (1 · NiGd), Tb (2 · NiTb), Dy (3 · NiDy), Ho (4 · NiHo), Y (5 · NiY); M = Zn, Ln = Gd (6 · ZnGd), Tb (7 · ZnTb), Dy (8 · ZnDy), Ho (9 · ZnHo); solvents = H2O or H2O-ethanol), was synthesized and characterized. All of the complexes are isostructural at 293 K and crystallize in the orthorhombic space group Fddd. Magnetic measurements were performed on 1–9, where weak ferromagnetic interaction is found in 1 · NiGd, ferromagnetic interaction in 2 · NiTb and 3 · NiDy, and anti-ferromagnetic interaction in 4 · NiHo. A remarkable dc magnetic field dependence of ac susceptibilities was found in this series of complexes.