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Solution studies were performed pH-metrically to study the interaction of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) metal ions with 5-fluorouracil (5FU) and histamine (Hm) separately (binary) and in the presence of each other (ternary) at 25+/-0.1( degrees )C temperature and a constant ionic strength of 0.1 M NaNO(3) in aqueous solution. The ternary complexes have been found to be more stable than the corresponding binary complexes as shown by the positive value of DeltalogK. The species distribution curves have been obtained using the computer programme BEST. On the basis of species distribution results, efforts were also made to prepare some mixed complexes of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) ions by performing the reaction of their metal nitrates, 5FU and Hm in aqueous ethanol medium at suitable pH. The isolated solid complexes were characterized by different physico-chemical method in order to suggest the possible binding site of the ligands and the structure of the resultant complexes. All these complexes were checked for their antitumour activity by injecting in Dalton's lymphoma (DL) and Sarcoma-180 (S-180) bearing C(3)H/He mice. The results indicate that some complexes have good antitumour activity both in vivo and in vitro.

Metal–5-Fluorouracil–Histamine Complexes: Solution, Structural, and Antitumour Studies