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The aim of this study was to characterize poly(amidoamine) (PAMAM) dendrimer complexes of Co(II) ions by using UV-Vis spectroscopy. For this aim, a generation-4 polypropylene oxide (Jeffamine ® T-403) cored and amine-terminated PAMAM dendrimer (P 4 ) was used as a model complexation agent. Optimum complexation condition for P 4 was determined by potentiometric and spectroscopic titration studies. Extent of protonation (EOP) of the amino groups of P 4 was determined from the potentiometric titration data and validated with spectroscopic titration data. The results indicated that pH 8 was the optimum dendrimer aqueous solution media, where the available number of tertiary amines present in P 4 was the highest for possible metal complexation. At the optimized conditions, UV-Vis characterization of the Co(II)-P 4 complexes was performed and 585–635 nm d-d transition bands were observed as the characteristic complexation bands of the tertiary amine groups of P 4 with Co(II) ions. Obtained Co(II)-P 4 complexes might be considered for the development of magnetic resonance image (MRI) improvers or MRI contrast agents.

Characterization of Co(II)-PAMAM dendrimer complexes with polypropylene oxide core by using UV-VIS spectroscopy