SEARCH Articles Figures Tables Complex planar Complex square-planar nickel hydride Nickel complexes square-planar structures Nickel complexes square-planar-tetrahedral equilibrium Nickel macrocyclic complexes square-planar species Nickel planar complexes Nickel-macrocycle complex square planar Square planar complexes Square-planar nickel macrocyclic complexes Square-planar nickel macrocyclic complexes properties Square-planar nickel macrocyclic complexes synthesis Square-planar nickel macrocyclic complexes, reactions