Abstract
Simple 1:1 adducts of the antitumor complex, Rh2(acetate)4, have been prepared with Adenine and Adenosine, and the binding site assigned as N7 of the purine ring. The similarity in properties between these species and those of Rh2(acetate)4/DNA solutions indicates unequivocally the same binding site for DNA and the specificity of the reaction is interpreted as due to the presence of favorable H-binding interaction between the exocyclic amino group of adenine and the hydrogen-bond acceptor acetate ligand.