Observation of promoted C-O bond weakening on the heterometallic nickel-silver: Photoelectron velocity-map imaging spectroscopy of AgNi(CO)n(-)

摘要

We report a joint experimental and theoretical study on heterodinuclear silver-nickel carbonyl clusters: AgNi(CO)n- and AgNi(CO)(n)(-) (n = 2, 3). The photoelectron spectra and photoelectron angular distribution provide information on the electronic structures and geometries of these complexes. Electron affinities of AgNi(CO)(2) and AgNi(CO)(3) are measured from the photoelectron velocity-map imaging spectra to be 2.29 +/- 0.03 and 2.32 +/- 0.03 eV, respectively. The complementary theoretical calculations at the B3LYP level and Franck- Condon simulations are performed to establish their geometrical structures. The C- O stretching modes are activated upon photodetachment and determined to be 2024 and 2028 cm(-1) for AgNi(CO)(2) and AgNi(CO)(3), respectively, which are notably red- shifted with respect to those of corresponding unsaturated binary nickel carbonyls. These findings will shed light on the promoted C-O bond weakening by the introduction of a foreign atom to binary unsaturated TM carbonyl complexes. Published by AIP Publishing.