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• W2041950013 abstract "Abstract To understand the effect of Au and thiol atoms in octane molecule, a structural and charge density analysis has been carried out by high level ab initio quantum chemical calculations using MP2 and B3PW91 methods with the basis sets 6-311G(d,p) and LANL2DZ . The optimized geometries, specifically, the geometry obtained from both levels reveal the effect of S- and Au-atoms in octane molecule. An introduction of sulfur atom in octane molecule lengthen its backbone C–C bond distances, and further adding of Au-atom at the terminals of octane dithiolate stabilizes these distances. The bond densities of the C–C bonds of octane are ∼1.6 eA −3 , these values are decreased significantly and the charges are largely depleted, when thiol and Au-atoms added in the octane molecule. The presence of negative Laplacian ∇ 2 ρ ( r ) at bond critical points of C–C and C–H bonds, indicate, the charges are concentrated in these bonds, confirm that these bonds exhibit an open shell type interaction. The moderate values of density and the negative Laplacian of S–C bonds confirm the covalent character. The positive ∇ 2 ρ ( r ) value of Au–S bonds, characterize, the bonding interaction is a closed shell interaction. The combined observed low value of electron density and the positive Laplacian of Au–S bond comprises, the gold and S interaction is not a covalent interaction, but it is a very weak coordination bond interaction. The small positive value of total energy density in Au–S bond indicates, the charges in these bonds are highly depleted and this is further confirmed by the Laplacian of bond characterization." @default.
• W2041950013 created "2016-06-24" @default.
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• W2041950013 date "2009-09-01" @default.
• W2041950013 modified "2023-09-27" @default.
• W2041950013 title "Effect of gold atom contact in conjugated system of one dimensional octane dithiolate based molecular wire: A theoretical charge density study" @default.
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• W2041950013 doi "https://doi.org/10.1016/j.theochem.2009.06.026" @default.
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