Vibrational spectra of the Tris(1,2-ethanediamine) rhodium(III) cation—II. Tentative assignment of the infrared and Raman spectra

Abstract The infrared and Raman spectra of Tris-(1,2-ethanediamine)rhodium(III) chloride and the corresponding 15 N substituted species have been recorded in the region below 4000 cm −1 in the solid state and in aqueous solution. A tentative assignment of the fundamentals is given based upon intensities, Raman depolarisation ratios, 15 N shifts, and the results of a normal coordinate analysis of the Λ-(δδδ)-tris(1,2-ethanediamine)-rhodium(III) cation. In the light of this evidence, previous data and assignments are discussed and revisions suggested. The possible influence on the solution spectra of the complex ions being in the lel or in the ob or mixed (δδλ) or (δλλ) conformation, respectively, is considered and discussed. Calculations indicate that the vibrational spectra of triscomplexes with digonal symmetry approximate closely to those of trigonal symmetry.