User:Benjah-bmm27/degree/4/JPHC

Photoinduced electron transfer

Simple d¹-d⁹ transition metal complexes

• Colour arises from d-d transitions
• Excited states very short lived
• Decay by internal conversion, a sequence of complicated steps that convert electronic energy into thermal energy

The [Ru(bpy)₃]²⁺ chromophore

• Tris(bipyridine)ruthenium(II) chloride, [Ru(bpy)₃]²⁺
• Ru²⁺ and three neutral 2,2'-bipyridine (bpy) bidentate ligands
• Absorbs a photon and undergoes metal-to-ligand charge transfer
• Excitation from [Ru^II(bpy)₃]²⁺ to [Ru^III(bpy)₂(bpy⁻)]²⁺

The water splitting reaction

• Water splitting
• Photocatalytic water splitting
• Paraquat dication, AKA dimethylviologen, MV²⁺

Mixed-valence compounds

• Inner sphere electron transfer – electron(s) transferred from one metal atom to another via a bridging ligand
• Mixed valence compounds – contain the same element in two different oxidation states

Magnetite

• Magnetite, Fe₃O₄ is a mixed valence iron oxide, containing both Fe²⁺ and Fe³⁺
• Its electrical conductivity is a million times greater than isovalent Fe₂O₃, which contains only Fe³⁺

Prussian blue

• Prussian blue, , also contains both Fe²⁺ and Fe³⁺
• A three-dimensional coordination network of octahedral low-spin {Fe^II(CN)₆} and high-spin {Fe^III(NC)₆} nodes
• Its intense blue colour is due to electron transfer from Fe²⁺ to Fe³⁺

The Robin-Day Classification

• Robin-Day Classification

The Creutz-Taube ion

• Creutz-Taube complex