Two 3d-4/heterometallic one-dimensional chains with neutral 4,4'-bipyridine ligands as linkers and[Cu_2Ln_2]clusters(Ln = Gd for 1,Dy for 2) as nodes have been hydrothermally synthesized and structurally characterized.Magnetic studies indicate that complex 1 exhibits a relatively large magnetocaloric effect,with an entropy change-△S_m^(max) = 24.8 J kg^(-1)K^(-1),whilst,complex 2 features slow magnetic relaxation at low temperature.
The self-assembly of polyalcohol ligand 1,1,1-tris(hydroxymethyl)ethane with Dy(NO_3)_3 6H_2 O and Cr_3O-Bzo-t-Bu precursor in the presence of triethylamine step-by-step generated a heterometallic 3d–4f chain. Magnetic investigation of the complex indicates typical slow relaxation of the magnetization at low temperature.
Mei-Hui YuXue JiangSong-De HanQing-Lun WangXian-He Bu
