Molecular Orbital Diagrams

1. Molecular Orbital Diagrams Ru2+ Multiplicity = 2S+1 E Ground state S = _____ Multiplicity = _____ Ru d-orbitals Spherical electric field [Ru(en)6]2+ [Ru(bpy)3]2+ Slide #2

2. Metal-to-ligand charge transfer (MLCT) λ = 450 nm Ground state MLCT excited state Slide #3

3. Absorption of UV/visible light causes movement of _____________ between _______________. ______________ transitions happen between ____________. Rueg* Rueg* Rueg* Rueg* bpyπ* bpyπ* bpyπ* bpyπ* Ru t2g Ru t2g Ru t2g Ru t2g E E E E bpyπ bpyπ bpyπ bpyπ ππ*state 1MLCT state 3MLCT state 1MC state e– config. e– config. e– config. e– config. Slide #4

4. [Ru(bpy)3]2+ excited state processes 1. 2. a. b. E 3. a. b. Nuclear coordinate Slide #5

5. Electronic Transitions 1. _____________________________ 2. __________________________ T2 S1 T1 T2 S1 E E T1 S0 S0 Nuclear coordinate Slide #6

6. S2 S2 S2 S2 S2 S2 T2 T2 T2 T2 T2 T2 S1 S1 S1 S1 S1 S1 E E E E E E T1 T1 T1 T1 T1 T1 S0 S0 S0 S0 S0 S0 Transition _________________ Transition _________________ Transition _________________ Transition _________________ Transition _________________ Transition _________________ Slide #7

7. Excited State Quenching 3MC 1MLCT 3MLCT E The 3MLCT lifetime is ___________. 1GS The 3MLCT state is deactivated by molecules in solution called ____________________. Nuclear coordinate Slide #8