Efficient photoinduced energy transfer mediated by aromatic homoconjugated bridges.
A new donor-bridge-acceptor (D-B-A) dyad consisting of ruthenium(II) and iridium(III) species separated by an homoconjugated bridge derived from 7,7-diphenylnorbornane [Ir-Nor-Ru](3+) has been synthesised. The photophysical and electrochemical properties of the heterodinuclear complex have been compared with those of the analogous homodinuclear complexes [Ru-Nor-Ru](4+) and [Ir-Nor- Ir](2+) . Transient absorption spectra on the nanosecond and sub-picosecond timescales show, for the first time, that an homoconjugated bridge can mediate efficiently in the photoinduced energy transfer from the iridium(III) to the ruthenium(II) centres according to a Dexter-type mechanism.
Osío Barcina
José
J
Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain. josio@quim.ucm.es
Herrero-García
Noelia
N
Cucinotta
Fabio
F
De Cola
Luisa
L
Contreras-Carballada
Pablo
P
Williams
Rene M
RM
Guerrero-Martínez
Andrés
A