A series of new platinum(II) and platinum(IV) adducts of type [P-11(cis-1,4-DACH)LCI]NO3, where cis- 1,4-DACH=cis-1,4-diaminocyclohexane, and L=9-ethylguanine, 1-methylcytosine, adenine, adenosine, cytosine, cytidine, guanine, and [Pt-IV(cis-1,4-DACH)-Ltrans-(X)(2)Cl]NO3, (where Y=hydroxo or acetato), were synthesized and characterized by elemental analysis, infrared spectroscopy, and H-1 and Pt-195 nuclear magnetic resonance spectroscopy. (C) 2003 Elsevier Inc. All rights reserved.