Chemistry Reference
In-Depth Information
Me
Me
Me
Me
Me
Me
O
O
O
O
Me
O
O
Me
Me
Me
O
O
O
O
O
O
Me
Me
O
O
O
O
Me
Me
O
O
O
O
O
O
Me
O
Me
O
O
O
Me
O
O
Me
Me
Me
O
O
O
O
Me
Me
O
O
N
N
N
N
N
N
O
Zn
Zn
O
Me
Me
N
N
O
O
O
O
O
O
Me
O
Me
O
O
O
N
N
N
Zn
N
O
O
O
O
Zn
Me
O
O
Me
N
N
N
N
O
O
O
O
O
O
N
N
Me
Me
N
Zn
N
O
Zn
N
N
O
Me
Me
N
N
O
O
R
N
N
N
NH
N
Zn
R'
R'
N
N
HN
P
L
R'
O
PL
1
: R = L; R' = H
PL
4
: R = R' = L
SCHEME 11.8
Dendrimers containing a free-base porphyrin core and 1, or 4 dendrons L
constituted by 7 Zn(II)-porphyrins and dimethoxybenzene units.
an energy accepting core, mimics several aspects of the natural light-harvesting
LH1 complex.
11.5 DENDRIMERS WITH LUMINESCENT UNITS
ENCAPSULATED IN THE DENDRIMER DYNAMIC CAVITIES
Fluorescence depolarization of a guest hosted inside a dendrimer give us information
about the association process, the guest mobility, and/or energy migration among
guest molecules if more than one guest is encapsulated per dendrimer.
11.5.1 Eosin Molecules Enclosed in a Dendrimer
It is well-known [29,30] that poly(propylene amine) dendrimers in dichloromethane
solution can extract eosin from aqueous solution. In particular, the fourth-generation
poly(propylene amine) dendrimer G4
(Scheme 11.9) decorated at the peripherywith
32 dimethoxybenzene groups can host one or more eosinmolecules, depending on the
relative concentrations of dendrimer and eosin in the dichloromethane and aqueous
solutions used for the extraction. In all cases, the average number of eosin molecules
B
