A bonding study of c-C5H8 adsorption on Pt(1 1 1)

The chemisorption of cyclopentane (c-C5H8) on Pt(1 1 1) has been studied using a qualitative band-structure calculations in the framework of tight-binding implementation with the YAeHMOP package. We modeled the metal surface by a twodimensional slab of finite thickness with an overlayer of c-C5H8, in a (3 3) di-s geometry. The c-C5H8 molecule is attached to the surface with its C C atoms bonded mainly with two Pt atoms while the opposite CH2 bends towards the surface. The Pt–Pt bonds in the underlying surface and the C–C bonds of c-C5H8 are weakened upon the chemisorption. A noticeable Pt–H and Pt– C interactions has been observed.We found that of Pt 5d2 z band plays an important role in the bonding between c-C5H8 and the surface, as do the Pt 6s and 6pz bands. The HOMO-LUMO bands of c-C5H8 are very dispersed, indicative of a strong interaction with the metal surface.