195Pt NMR of Pt309Phen36*O30 Metallic Clusters

195Pt NMR lineshape and spin-lattice relaxation measurements at 77 K are presented for the polynuclear metallic cluster compound Pt309Phen 36 * O30 Two peaks in the NMR lineshape are found centered at Ho/v0=1.110 G/kHz and 1.096 G/kHz. The high field peak is attributed to Pt spins located in the interior of the cluster which are in a metallic environment. The low field peak has its origin in platinum atoms that constitute the surface shell of the cluster. These atoms are involved in chemical bonds with the ligands.