inorganic chemistry

the reduction of the vibrational modes available to the head
groups within the confined environment of the aggregate.
Upon combination of complexes 1 and 2 in an equimolar
0.025 mM aqueous solution, the absorption spectrum displayed
features of both complexes. On the contrary, the emission spec-
trum of such mixture showed a maximum centered at 645 nm,
which resembled only one of the complex 1 , while the emission
of complex 2 was not detected. The time-resolved emission anal-
ysis confirmed that the decay was only related to complex 1
above the CMC. These findings strongly indicate a full and effi-
cient energy transfer process involving the iridium-based
metallosurfactant 2 , being quenched by the ruthenium-based
amphiphilic complex 1 in a system that can be depicted as a
mixed aggregate.
No bimolecular quenching process could be detected at the
employed concentrations for the reference complexes.
To gain deeper insight into the energy transfer process as
well as to explore the possibility to tune such a process, a
“diluting”surfactant as CTAB which possesses a higher CMC

Ru

(Acceptor)

(Donor)

hn

ET

hn′

1 N

2

N

N

F

F

F F

N

N

N

N

Ir

N

N

N

2+

2 CI–

CI–

+

FIG. 7. Schematic formulas of the metallosurfactants and their self-
assembly in mixed aggregates.

PHOTOPHYSICS OF MOLECULAR ASSEMBLIES 65