A planar tetradentate 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (BpymTz) templating chelate affords the formation of an unprecedented BpymTz˙− radical anion bridged {NiII4} complex. Detailed magnetic measurements performed on the isolated air stable [NiII4(BpymTz˙−)Cl6(DMF)8]Cl·0.5(H2O) compound reveal strong ferromagnetic NiII–BpymTz˙− interactions with a coupling constant of J = 98.84 cm−1.
