IR and ^<13>C NMR measurements in hetero-metal complexes, [Pd(en)_2] [PtX_2(en)_2] (NO_3)_4 (X: Cl, Br) afforded two kinds of signals assignable to Pd and Pt moieties, indicating the formation of the Pd(II)-X-Pt(IV)-X-type chain structure. Weak ESR signal observed in [Pt(en)_2] [PtCl_2(en)_2] (NO_3)_4 suggested the formation of only small amounts of spinsoliton.