Abstract
Systematic investigations on lowest energy CO adsorbed neutral and ionic Rhn (n = 2–8) clusters in the gas phase are performed with all electron relativistic method using density functional theory within the generalized gradient approximation. Geometrical and electronic parameters are evaluated to understand the bonding nature as well as the binding interaction of CO on stable neutral and ionic rhodium clusters. Anionic adducts exhibit higher adsorption energy along with smaller Rh–C and larger C–O bond distances in comparison to neutral and cationic RhnCO (n = 2–8) clusters. Synergic bond formation is noticed between rhodium and carbon atom of CO molecule due to back-donation of electron from metal d-orbitals to π* orbital of CO in the case of anionic and some neutral clusters. Angular and Mulliken charge analysis along with electron density distribution suggest that anionic rhodium clusters form strong bond with carbon atom of CO than the neutral and cationic clusters.
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