The process of Gd
3+ complexation with 4-dihydroxyborophenylalanine (DHBPA) in aqueous solutions was studied by the contact conductometry, IR,
and X-ray photoelectronic spectroscopy methods. The complex formation reactions of Gd
3+ with DHBPA were found to occur in steps, depending on the metal: ligand ratio. In the final reaction product, i.e., the chelate
complex [Gd(DHBPA)
3], each molecule of a ligand occupies two coordination sites.
Original Russian Text © E.N. Demidova, A.I. Drachev, N.A. Borshch, 2008, published in Koordinatsionnaya Khimiya, 2008, Vol.
34, No. 10, pp. 797–800.