Suresh Purohit and N Bhojak
Complexes of some lanthanides such as Pr (Praseodymium), Nd (Neodymium), Sm (Samarium) and Tb (Terbium) gives absorption bands in the visible region of the spectrum. The Pr(III), Nd(III), Sm(III) and Tb(III) ions have four, ten, seven and two peaks respectively in their absorption bands. On the other hand Gd (Gadolinium) gives absorption band in UV- region and it has two peaks in its absorption band.
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