Binary copper carbonyls. Synthesis and characterization of tricarbonylcopper, dicarbonylcopper, monocarbonylcopper, and hexacarbonyldicopper

Electromagnetic interactions of molecules with metal surfaces

“…This positive value for the chemical shift is surprising, since one would expect bonding effects to weaken the bond, leading to a negative chemical shift. Indeed, the experimental evidence on copper carbonyls [90] suggests a chemical shift of about -160 cm~.The conclusion we draw from this is not that the electromagnetic contribution to the shift is absent, but that the observed width is probably due to inhomogeneous broadening, corresponding to CO adsorbed on a variety of sites on the metal surface. In addition, the bonding in CO adsorbed on copper is probably much different from that in copper carbonyls.…”

“…Provided this shift is small it can be added to the mechanical shift, and the two in turn added to the electromagnetic shift. There is good evidence from experiments on isotopic varieties of copper carbonyls [90]that this picture of a chemical change in bond strength together with a mechanical shift as given by (4.71) is consistent.…”

Gas-phase kinetics and catalytic reactions of small silver and gold clusters

“…For the case of group Ia metals, however, carbonyls are only weakly bound, because the d shell is fully occupied. Carbonyl donation is possible only into an s or a p metal orbital and back-donation into the CO p * orbital is not very favorable because of the generally low energy of the d orbitals, in particular for silver [17,97].…”

Metal‐ligand interactions of the Cu‐NO complex at the ground and low‐lying excited states: an ab initio MO study

“…This point in the Cu/NO system is much different from that in the Cu/CO system in which Cu(CO) x (x = 1, 2 and 3) complexes were observed [3]. They also suggested that the interaction between Cu and NO is closer to a covalent bond than an ionic bond.…”

“…They showed that the interactions between the Cu atom and the molecules are composed of an ionic bond rather than a covalent bond. As an early work, Ozin and coworkers published a very complete study of Cu-CO interactions in cryogenic matrices [3].They identified at least three monocopper complexes and one dicopper complex using a combination of IR and UV/visible spectroscopy [3].…”