1987 Volume 60 Issue 3 Pages 919-924
The Raman spectra of the tris(bidentate)cobalt(III) complexes containing the six-membered tn and/or β-ala chelate ring, where tn and β-ala denote 1,3-propanediamine and β-alaninate respectively, were measured in order to investigate the relation between the Raman spectra and the structures of the complexes. The Raman bands can be classified into four vibration modes: A totally symmetric stretching vibration mode in the 440–640 cm−1 region, a stretching vibration mode excluding the totally symmetric one in the 380–480 cm−1 region, a metal-ligand skeletal bending deformation mode in the 260–400 cm−1 region, and a chelate ring deformation mode in the 220–290 cm−1 region. The present complexes characteristically exhibited more Raman bands than the complexes with the five-membered chelate rings in the totally symmetric stretching vibration mode. For the [Co(β-ala)2(tn)]+ complex, the three geometrical isomers, trans(O), C2-cis(O), and C1-cis(O), which were prepared for the first time, each exhibited characteristic Raman spectral features.
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