Co II /Mn II MOFs containing the characteristic double metal chains: Synthesis, structure and magnetic property

Abstract Two isostructural Co II and Mn II metal-organic frameworks (MOFs), {[M 2 (tztr) 2 (H 2 O)]·CH 3 CN·H 2 O} n (M = Co II for 1 and Mn II for 2 ), have been successfully synthesized based on a semi-rigid 3-(tetrazol-5-yl)triazole (H 2 tztr) ligand. Crystal structure analyses reveal that the complexes possess three-dimensional (3D) frameworks featuring two types of interesting 1D zig-zag and linear metal chains. Magnetic measurements reveal that the special bridge within the double chains of complex 1 provides unexpected spin canting, long-range antiferromagnetic ordering and relaxation dynamics. Whereas the isostructural 2 displays normal antiferromagnetic coupling.