Reactions of laser-ablated Ni, Pd, and Pt atoms with carbon monoxide:: Matrix infrared spectra and density functional calculations on M(CO)n (n=1-4), M(CO)n- (n=1-3), and M(CO)n+ (n=1-2), (M = Ni, Pd, Pt)

Laser-ablated Ni, Pd, and Pt atoms have been reacted with CO molecules followed by condensation in excess neon at 4 K. Besides the neutral metal carbonyl Species, metal carbonyl anions [M(CO)(n)(-) (n = 1-3)] and cations [Ni(CO)(n)(+) (n = 1-4), Pd(CO)(n)(+) (n = 1,2), and Pt(CO)(n)(+) (n = 1-3)] have been produced and identified. Doping with the CCl4 electron trap increases cation and decreases anion absorptions and confirms the identification of the ionic species. The excellent agreement between observed bands and frequencies and isotopic frequency ratios from the DFT calculations supports the vibrational assignments and the identification of these metal carbonyl complexes.