IR spectra of ErCl//3 multiplied by (times) 6H//2O/organic solvent (1:10 ratio) were taken in a solution of acetonitrile. Some concerns exist about the presence of solvent molecules in the inner coordination sphere of the lanthanide ion in systems of this nature. Preliminary spectra exhibit shifts in the IR spectra of the organic solvents, methanol, ethanol, N,N-dimethylformamide, and dimethylsulfoxide under these conditions. These data indicate the presence of these molecules in the inner coordination sphere. A second study is concerned with the interaction of Tb**3**30 with nucleosides in aqueous and dimethylsulfoxide (DMSO) solution. spectra of the DMSO solutions exhibit shifts in the IR for the carbonyl moiety of cytidine, uridine, xanthosine, and guanosine.
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