Density functional theory study of structural, electronic and CO adsorption properties of anionic Scn- (n = 2-13) clusters

Publication date: Available online 27 June 2019Source: Computational and Theoretical ChemistryAuthor(s): Saira Sajjad, Muhammad Ali Hashmi, Tariq Mahmood, Khurshid AyubAbstractClusters are aggregates or assemblies of atoms and have properties intermediate between bulk and molecules. Among transition metals, the studies regarding scandium cluster and in particular anionic scandium clusters are very scarce. Herein, geometric and electronic properties of anionic scandium clusters Scn- (n = 2-13) are studied by gradient-corrected exchange-correlation functional PBEPBE with LANL2DZ basis set. A number of possible geometries are taken into account for optimizations at different spin states. Furthermore, their relative stabilities have been evaluated by different parameters such as relative stability, binding energies and second order energy differences. Electronic properties are judged from vertical ionization energies, vertical electron affinities and HOMO-LUMO gaps. In addition, the role of pristine Scn- (n = 2-8) clusters as a CO adsorption surfaces are also evaluated. The larger interactions energies for Sc-CO clusters depict their higher stability in comparison to Sc-OC interaction mode.Graphical abstract

Source: Computational and Theoretical Chemistry - June 28, 2019 Category: Chemistry Source Type: research