Lanthanide nitrate single-ligand complexes

In the case of complexes of lanthanide nitrates with CP (239), the infrared spectra exhibit two uCz=Q vibrations apart from a single pP=0- The J>p=o and one of the c=o vibrations occur at frequencies lower than the corresponding ligand frequencies But the second r>c=0 1S not much shifted from the free ligand value. These observations have been interpreted in terms of Structure VIII containing both coordinated... 

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