Room-temperature spin crossover observed for [(TPyA)FeII(DBQ(2-))Fe(II)(TPyA)](2+) [TPyA = Tris(2-pyridylmethyl)amine; DBQ(2-) = 2,5-Di-tert-butyl-3,6-dihydroxy-1,4-benzoquinonate].

Dinuclear [(TPyA)FeII(DBQ2-)FeII(TPyA)](BF4)2 possesses extensive pi-pi interactions between the FeII dimers that give rise to a two-dimensional supramolecular sheet structure. The magnetic susceptibility shows a room-temperature spin-crossover behavior; however, thermal hysteresis is not observed.