Photo -induced Electron Transfer Between Ruthenium (II) tris –( 2,2´ - bipyrdine ) and Methyl Viologen

Electron transfer (ET) reactions represent an elementary chemical process which occurs inElectron transfer (ET) reactions represent an elementary chemical process which occurs in a large variety of molecules, ranging from small ion pairs up to large biological sy stem. A theoretical study of photo – induced electron transfer between Ruthenium (II) tirs -( 2,2´ - bipyrdine ) Ru(bpy) 2+3 and Methy l Viologen MV2+ in a variety of Solvents at room temperature is presented . This study is based on an optical activation by the absorption of light .The Solvent is described by a dielectric continuum model, and the transferring is represented by a quantum mechanical wave function . In this application, the reorganization energy λ , the driving free energy ∆G° , and the activation free energy ∆G ‡ are calculated with semi classical model . The electronic coupling for the electron transfer DA V reaction is taken from Mulliken –Hush method, and the rate of electron transfer KET in Ru(bpy) 2+3 - MV 2+ system are calculated with a quantum mechanical model. Our calculation results for the electron transfer in Ru(bpy) 2+3 - MV 2+ system show agood agreement with the experimentally observed results .