HYPOXANTHINE COMPLEXES WITH FIRST ROW TRANSITION METAL PERCHLORATES+

Abstract

Abstract Complexes of hypoxanthine (hxH) with 3d metal perchlorates were synthesized by refluxing mixtures of ligand and metal salt in ethyl acetate-triethyl orthoformate. In all cases investigated, partial substitution of one anionic hx″ for one C104 group occurred. The solid complexes isolated contain also two or three neutral hxH ligands per metal ion, vizM(hx)(hxH)3 (C104)2 (M = Cr, Fe), M(hx)(hxH)3 C104 H2 0 (M = Mn, Cu, Zn), Co(hx)(hxH)3 C104 and M(hx)(hxH)2 C104 H2 0 (M = Fe, Ni). The new complexes appear to be generally polymeric species characterized by a single-bridged -M-hx-J-, backbone, in which bidentate hx' probably binds viaN3 and N7 to adjacent metal ions. The neutral hxH ligands are terminal N7-bound. The Co(II) complex is pentacoordinated with three terminal hxH ligands and ionic C104. The rest of the complexes are hexacoordinated, containing two or three terminal hxH ligands and the following additional ligands; M = Fe2 +, Ni2+ : -OC103, aqua; M = Cr3 +, Fe3+ : -OC103 (also ionic C104); M = Mn2 +, Cu2 +, Zn2+ : aqua (C104 is ionic).