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Foi estudado a complexacao do acido guanidoacetico (AGA) com alguns ions de interesse biologico, a saber : Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) e Pb(II). Apos o AGA ter sido sintetizado e caracterizado, foram determinadas potenciometricamente as constantes de dissociacao deste ligante, assim como a de formacao de seus complexos e hidroxicomplexos com os ions supracitados. A maioria dos ions estudados formou complexos do tipo MAGA, M(AGA)2 e M(AGA)3. O Zn(II) e o Cu (II) nao formaram as especies M(AGA)3 e MAGA(OH)3 . A hidrolise dos complexos CuAGA e ZnAGA iniciou-se em pH proximo de 6-7 e para as demais especies MAGA, em pH proximo de 8, sendo que apos estes valores houve a predominância de especies polimeras hidrolisadas.

A potentiometric study of guanidinoacetic acid complexation with the ions Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II)