17 research outputs found
A theoretical study of structure and stability of borohydride on 3d transition metals
The adsorption of borohydride on 3d transition metals (Cr, Mn, Fe, Co, Ni and
Cu) was studied using first principles calculations within spin-polarized density
functional theory. Magnetic effect on the stability of borohydride is noted. Molecular
adsorption is favorable on Co, Ni and Cu, which is characterized by the strong s-dzz
hybridization of the adsorbate-substrate states. Dissociated adsorption structure yielding
one or two H adatom fragments on the surface is observed for Cr, Mn and Fe
Role of decomposition products in the oxidation of cyclohexene using a manganese(III) complex
Metal complexes are extensively explored as catalysts for oxidation reactions; molecular-based mechanisms are usually proposed for such reactions. However, the roles of the decomposition products of these materials in the catalytic process have yet to be considered for these reactions. Herein, the cyclohexene oxidation in the presence of manganese(III) 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine chloride tetrakis(methochloride) (1) in a heterogeneous system via loading the complex on an SBA-15 substrate is performed as a study case. A molecular-based mechanism is usually suggested for such a metal complex. Herein, 1 was selected and investigated under the oxidation reaction by iodosylbenzene or (diacetoxyiodo)benzene (PhI(OAc)2). In addition to 1, at least one of the decomposition products of 1 formed during the oxidation reaction could be considered a candidate to catalyze the reaction. First-principles calculations show that Mn dissolution is energetically feasible in the presence of iodosylbenzene and trace amounts of water