Author : Hamid. I. Abbood

B3LYP/6-31G (d , p) density functional theory has been employed to calculate the geometry optimization and energies of donor-nanobridge-acceptor molecular system. The electronic states of the system has been calculated depend on Koopman’s theorem under the orbital-vertical theory.The results show that the functional used in the description of the studied molecular system has been proved its validity in calculating the HOMO and LUMO energies and it is a suitable for studying the geometry optimization for the organic molecular system. The energy level diagram shows that there are localized orbitals in different parts of the D-B-A molecular system in which that satisfy important property for the D-B-A system as a molecular electronics.

Keywords: B3LYP , DFT, total energy , energy gap, HOMO and LUMO

Article published in International Journal of Current  Engineering  and Technology, Vol.4,No.1 (Feb- 2014)