[2] Catenanes decorated with porphyrin and [60] fullerene groups: design, convergent synthesis, and photoinduced processes

JD Megiatto Jr, DI Schuster, S Abwandner… - Journal of the …, 2010 - ACS Publications
JD Megiatto Jr, DI Schuster, S Abwandner, G de Miguel, DM Guldi
Journal of the American Chemical Society, 2010ACS Publications
A new class of [2] catenanes containing zinc (II)− porphyrin (ZnP) and/or [60] fullerene (C60)
as appended groups has been prepared. A complete description of the convergent synthetic
approach based on Cu (I) template methodology and “click” 1, 3-dipolar cycloaddition
chemistry is described. This new electron donor− acceptor catenane family has been
subjected to extensive spectroscopic, computational, electrochemical and photophysical
studies. 1H NMR spectroscopy and computational analysis have revealed that the ZnP …
A new class of [2]catenanes containing zinc(II)−porphyrin (ZnP) and/or [60]fullerene (C60) as appended groups has been prepared. A complete description of the convergent synthetic approach based on Cu(I) template methodology and “click” 1,3-dipolar cycloaddition chemistry is described. This new electron donor−acceptor catenane family has been subjected to extensive spectroscopic, computational, electrochemical and photophysical studies. 1H NMR spectroscopy and computational analysis have revealed that the ZnP−C60−[2]catenane adopts an extended conformation with the chromophores as far as possible from each other. A detailed photophysical investigation has revealed that upon irradiation the ZnP singlet excited state initially transfers energy to the (phenanthroline)2−Cu(I) complex core, producing a metal-to-ligand charge transfer (MLCT) excited state, which in turn transfers an electron to the C60 group, generating the ZnP−[Cu(phen)2]2+−C60•− charge-separated state. A further charge shift from the [Cu(phen)2]2+ complex to the ZnP subunit, competitive with decay to the ground state, leads to the isoenergetic long distance ZnP•+−[Cu(phen)2]+−C60•− charge-separated radical pair state, which slowly decays back to the ground state on the microsecond time scale. The slow rate of back-electron transfer indicates that in this interlocked system, as in previously studied covalently linked ZnP−C60 hybrid materials, this process occurs in the Marcus-inverted region.
ACS Publications
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