Transcript [Ru(bpy)3]2+ Photochemistry

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
Metal-to-ligand charge transfer (MLCT)
λ = 450 nm
Ground state
MLCT excited state
Slide #3
Absorption of UV/visible light causes movement of _____________ between _______________.
______________ transitions happen between ____________.
Ru eg*
Ru eg*
Ru eg*
Ru eg*
bpy π*
bpy π*
bpy π*
bpy π*
E
E
E
E
Ru t2g
Ru t2g
Ru t2g
Ru t2g
bpy π
bpy π
bpy π
bpy π
ππ* state
e– config.
1MLCT
state
e– config.
3MLCT
state
e– config.
1MC
state
e– config.
Slide #4
[Ru(bpy)3
2+
]
excited state processes
1.
2.
a.
b.
E
3.
a.
b.
Nuclear coordinate
Slide #5
Electronic Transitions
1. _____________________________
2. __________________________
T2
S1
T1
T2
S1
E
E
T1
S0
S0
Nuclear coordinate
Slide #6
S2
E
S2
T2
S1
T1
E
S0
E
T2
S1
T1
E
S0
Transition _________________
S2
S2
T2
S1
T1
S0
Transition _________________
E
S1
T1
S0
Transition _________________
S2
T2
Transition _________________
S2
T2
S1
T1
S0
Transition _________________
E
T2
S1
T1
S0
Transition _________________
Slide #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