Abstract
The oxalate group appears to be tetradentrate in many a complex of the lanthanide series. The results obtained for the N 2O 4 molecule have enabled us to apply the coincidence method for the correct attribution of the vibrational frequencies of the free oxalate ion (V h symmetry). A complete survey, in normal coordinates of the C 2O 4M 2 plane group having the same V h symmetry (where M is the lanthanide atom and the oxalate group is tetradentate) could therefore be performed. All measured frequencies, in infrared absorption as well as in Raman diffusion could then be assigned for several oxalate compounds of the lanthanide series. Exact structural conclusions can be drawn from the results of this vibrational analysis.
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