Probing the Metal Composition of Ternary 12–12′-16 Nanoclusters via Electrospray Ionization Mass Spectrometry



The reaction of [(3,5-Me2–C5H3N)2Zn(SeSiMe3)2] with a solution of Cd(OAc)2, Se(Ph)SiMe3 and PPr3 at low temperature was used to prepare single crystals of ternary group 12–12′-16 nanoclusters with the composition [Zn1.8Cd8.2Se4(SePh)12(PPr3)4]. A ligand exchange reaction using Na[SePh] was performed to displace the neutral PPr3 ligands. The resulting clusters were probed using electrospray ionization mass spectrometry to determine the number of zinc and cadmium atoms in the cluster and compared to the all cadmium cluster [Cd10Se4(SePh)12(PPr3)4]. The dianionic clusters [ZnxCd10–xSe4(SePh)14]2– where x = 0, 1, 2 were assigned in the mass spectra, revealing that the clusters exhibit elemental distributions that are quite narrow in these experiments.