EXCITED-STATE SPECTROSCOPY OF HEXACYANOCOBALTATE(III)

The hexacyanocobaltatc(III) anion, dissolved in an EPA matrix at 94 K. gives rise to a well-structured transient spectrum in the 365-500-nm range By means of a straightforward ligand field analysis the observed absorbance could be identified as the absorption spectrum of an excited 3T1g stale of the complex. Transitions to several components of a triplet clustcr, arising from a (t2g)4(eg)2 configuration, were assigned The interpretation is shown to be consistent with the luminescence properties, of this species. The present data allow for a direct electronic characterization of a relaxed excited state. The relevance of our results to the photochemistry of trivalent cobaltum compounds is discussed. © 1979, American Chemical Society. All rights reserved.