Novel metal cluster complexes synthesized by matrix deposition of mass-selected clusters

Metal complexes produced by depositing size se- lected Fe and Ag cluster cations in N2 and O2 matrices respectively are studied by infrared spectroscopy. Unknown species such as Fe(N2)x ,F e 3(N2)x and Ag3(O2)x are ob- served. The IR spectra of Ag + ,A g + and Ag + in excess O2 indicate that no complexes involving molecular oxygen are formed. However, the strong silver cluster UV-visible absorptions detected in Ar matrices disappear in the oxy- gen matrices, suggesting that silver-oxygen complexes are formed with dissociated oxygen.