Three dinuclear cyanide-bridged complexes [Fe^II(PY₅OMe₂)CNM^II(PY₅OMe₂)](OTf)₃ (M = Fe 1, M = Co 2, M = Mn 3) (PY₅OMe₂ = 2,6-bis-((2-pyridyl)methoxymethane)pyridine OTf = CF₃SO₃^-) have been synthesized and characterized. Single-crystal diffraction analyses show these three dinuclear compounds are very similar in structure. The measured ν(CN) results for compounds 1~3 suggest that Mn²⁺ is electron-poorer than Fe²⁺ and Co²⁺. Meanwhile, the temperature dependence of magnetic susceptibilities of complexes 1~3 reveals that in these three complexes, all the cyanide-carbon coordinated Fe(II) is low-spin, and Co(II) for 2 and Mn(II) for 3 are both in a high-spin state through 2~400 K but the cyanide-nitrogen coordinated Fe(II) for complex 1 exhibits spin crossover (SCO) behavior over 300 K and a hysteresis of 36 K in both cooling and heating modes.