Chemistry (Weinh.) Chemistry (Weinh.) Stepwise coordination of PtII-180°and PdII- 90°metal fragments to the purine nucleobase 9-methylhypoxanthine affords a closed octadecanuclear Pt6Pd12 cluster Albertí F. M. Zielinski W. Morell Cerda M. Sanz Miguel P. J. Universidad de Zaragoza Troeppner O. Ivanovic-Burmazovic I. Lippert B. 2013 research-article