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For instance, when ferrocenyl moieties are bound onto ruthenium nanoparticle surfaces by Rucarbene π bonds, apparent intervalence charge transfer between the ferrocenyl metal centers at mixed valence is observed, as clearly manifested in electrochemical and near-IR spectroscopic measurements. The behaviors are analogous to those observed in organometallic complexes with multiple metal centers bridged by onjugated linkers. Intraparticle charge delocalization has also been observed with fluorophores such as pyrene and anthracene that are attached to the nanoparticle surface by similar Rucarbene π bonds, whereby the particle-bound fluorophores exhibit emission characteristics that are consistent with those of their dimeric derivatives. More recently, we demonstrated that effective intraparticle charge delocalization might also be achieved with nanoparticles functionalized by acetylide derivatives through the formation of metal−acetylide dπ linkages。 |
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