Ferromagnetic Coupling between Low- and High-Spin Iron(III) Ions in the Tetranuclear Complex fac-[FeIIIHB(pz)3(CN)2(μ-CN)]3FeIII(H2O)3· 6H2O ([HB(pz)3]- = Hydrotris(1-pyrazolyl)borate) | Publicación