Molecular photochromic ferromagnetic based on the layered polymeric tris-oxalate of Cr(III), Mn(II) and 1-[(1′,3′,3′-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2′-indoline]-8-yl)methyl]pyridinium

Basing on 1-[(1′,3′,3′-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2′-indoline]-8-yl)methyl] pyridinium chloride, a new bifunctional compound C31H26N3O16CrMn has been synthesized, which exhibits ferromagnetic (Tk = 5.1 K) and photochromic properties in the solid state.