Controllable Fabrication of One-Dimensional and Two-Dimensional Compounds with Heterometallic Units: Syntheses, Crystal Structures, and Magnetic Properties

A heterometallic Cu-Ln dinuclear compound [(Me2CO)­Cu­(L)­Dy­(NO3)3] (1) (L = chiral Schiff base ligand) has been synthesized and structurally characterized. Employing the dinuclear compounds as secondary building units, three different coordination polymers [Cu­(L)­Dy­(dca)2­(NO3)] n (2) and [Cu­(L)­Ln­(dca)3] n (Ln = Sm (3) and Dy (4)) with dicyanamide bridges have been further prepared by controlling the metal–ligand ratios. Compound 2 exhibits a homochiral one-dimensional zig-zag skeleton. Compounds 3 and 4 are isomorphous and represent achiral two-dimensional sheets with 63 hcb topology. Magnetic measurements and simulated data revealed an antiferromagnetic Cu–Sm interaction in compound 3, whereas 4 holds a ferromagnetic Cu–Dy interaction through two phenoxo-oxygen atoms.