Electronic spectra have been recorded for a series of octahedral compounds [M (bipy),X,] and [M (bipy),X,]X'.where M = Fe. Ru, and 0s. X,X' = CI, Br, and I, and X2 = 22'-bipyridyl. Certain of the electronic spectral bands have been assigned to metal-oxidation and metal-reduction spectra. Shifts in these bands have, in some cases, been correlated with the bonding between metal and ligand.Carbon, hydrogen, and nitrogen analyses were determined by the Microanalytical Laboratory, University of Otago , New Zealand. Halides were determined gravimetrically as silver halide.Os (C,,H8N,),Br,,2H,0: Found: Br, 22.4; N, 7.95.
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