No abstract

The tetraaquaserine aluminium(III) cation complex was prepared from a mixture of solutions 5 mol l −1 of Al(NO 3 ) 3 ·9H 2 O and serine (Ser) at pH 0.5. Raman spectra of serine and of serine with Al(NO 3 ) 3 ·9H 2 O, both in aqueous solution, show that four water molecules participate in the coordination sphere of Al(III). Density functional theory calculations, DFT: B3LYP/3-21G, were performed for serine and for the [Al(Ser)(H 2 O) 4 ] 2+ cation complex. The vibrational results agree well with the experimental fourier transform (FT) Raman spectra in the higher and low-energy regions. For serine, the observed FT-Raman spectrum matches the DFT-calculated spectrum. Approximate assignments of the vibrational modes were made for both compounds. DFT-calculated geometric parameters are also given for serine and [Al(Ser)(H 2 O) 4 ] 2+ .