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An ab initio calculation was performed on the electronic structures of MoS,MoS_4~(2-) andMo_2S_2 using relativistic effective core potential(RECP)for molybdenum,and non-relativistic ECPfor sulfur.We predicted that the equilibrium bond length and the dissociation energy of MoS inground state are 3.89 a.u.and 4.67 eV,respectively,and that the bond is a triple-bond.The groundstate of MoS_4~(2-) in Td symmetry is ~1A_1 and π-bonding dominates σ-donation in the molybdenum-sulfur interaction.The Mo_2S_2 is a model contracted from bi-nuclear sulfur-bridged clusters,andthe bonding orbitals 1 b_(1u),1b_1g and 1b_2g make the dominant contribution to the stabilization of sulfur-bridged species.
An ab initio calculation was performed on the electronic structures of MoS, MoS_4 ~ (2-) and Mo_2S_2 using relativistic effective core potential (RECP) for molybdenum, and non-relativistic ECP for sulfur. We predicted that the equilibrium bond length and the dissociation energy of MoS inground states are 3.89 au and 4.67 eV, respectively, and that the bond is a triple-bond. The groundstate of MoS 4-4 in Td symmetry is ~ 1A_1 and π-bonding dominates σ-donation in the molybdenum-sulfur interaction. The Mo_2S_2 is a model contracted from bi-nuclear sulfur-bridged clusters, and the bonding orbitals 1 b_ (1u), 1b_1g and 1b_2g make the dominant contribution to the stabilization of sulfur-bridged species.