Abstract
The bimetallic complexes [(H 2O) 4Fe(bpm)Fe(CN) 4] and [(H 2O) 4Co(bpm)Fe(CN) 4], where bpm = 2,2′-bipyrimidine have been prepared and characterized by UV-Vis, IR, and Mössbauer spectroscopies. The Mössbauer spectrum of the diiron system is similar to the sum of the spectra of d 6 low-spin Fe(CN) 4bpm 2− and d 6 high-spin Fe(H 2O) 4bpm 2+. The Co/Fe mixed-metal bimetallic system shows only a single d 6 low-spin Fe(II) center in the 59Fe Mössbauer spectrum. The diiron system is the first small molecular unit reported where low-spin and high-spin Fe(II) centers exist in close proximity.
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