Biomedical Engineering Reference
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Fig. 8 Redox-controlled ring rotation in catenane 10 4+
Fig. 9 Photochemically and thermally induced motions taking place in catenane 11 2+
A clever strategy to obtain the light-driven rotation of the molecular rings in a
catenane was reported (Mobian et al. 2004 ) . Catenane 11 2+ (Fig. 9a , State 0) is
essentially a ruthenium(II) complex designed in order that visible excitation in ace-
tonitrile solution leads to the formation of metal-centered dissociative excited states
which, in turn, cause the decoordination of the bipyridine (BPY) ligand. As a result,
the rings mutually rotate to give the structure shown in Fig. 9b (state 1). Simple
heating regenerates the starting complex, with both reactions (decoordination/reco-
ordination) being quantitative. The overall process was monitored by NMR and
UV-vis spectroscopy.
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