Strong Coupling and Slow Relaxation of the Magnetization for an Air-Stable [Co₄] Square with Both Tetrazine Radicals and Azido Bridges

Abstract

Introducing both tetrazine radical and azido bridges afforded two air-stable square complexes [MII4(bpztz•–)4(N3)4] (MII = Zn2+, 1; Co2+, 2; bpztz = 3,6-bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine), where the metal ions are cobridged by μ1,1-azido bridges and tetrazine radicals. Magnetic studies revealed strong antiferromagnetic metal–radical interaction with a coupling constant of −64.7 cm–1 in the 2J formalism in 2. Remarkably, 2 exhibits slow relaxation of magnetization with an effective barrier for spin reverse of 96 K at zero applied field.