Dinuclear Nickel Complexes Doubly Bridged by Hydrogencyanamido Ligands: Synthesis, Structures and Magnetic Properties

Abstract

Novel dinuclear nickel complexes bridged by two hydrogencyanamido (NCNH–) ligands [(NiL)2(µ2‐NHCN‐N,N′)2]2+ have been synthesized and structurally characterized. X‐ray diffraction analysis suggests that each hydrogencyanamido ligand coordinates as a cyanamide anion (N≡C–NH–) rather than a carbodiimide anion (N+=C=NH–). The structure of the central (NiNCN)2 ring skeleton varies slightly depending on the ancillary ligands, which affects strength of the Ni···Ni antiferromagnetic coupling judging from the SQUID measurements.