Self-assembled meso-helicates of linear trinuclear nickel(ii)–radical complexes with triple pyrazolate bridges
Abstract
Complexation of 3-nitronyl-nitroxide-substituted . The opposite chirality around the inversion center at the central nickel(II) ion leads to a meso-helical symmetry in the whole molecule. The radical oxygen atoms participate in the 6-membered chelation at the terminal nickel(II) ions. Antiferromagnetic couplings were observed in both complexes, which are ascribable to interactions between the nickel and radical spins and between the nickel spins across the pyrazolate bridges.