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Two classes of (porphinato)zinc(II)-spacer-quinone electron transfer compounds were fabricated through metal-mediated cross-coupling reactions using appropriately derivatized porphyrin, dimethoxybenzene and phenylene spacer moieties. The syntheses of these electron transfer model systems utilized either a (2,5-dimethoxyphenyl)boronic acid or a boronic acid derivative of a 2,5-dimethoxyphenyl-substituted spacer compound which was subsequently coupled to either [5-(4′-bromophenyl)-10,15,20-triphenylporphinato]zinc(II) or 4-bromopyridine; the former species define compounds in which to probe the magnitude of electronic coupling between the meso-appended spacer moiety and the porphyrin carbon framework, while the latter constitute acceptor-modified, rigid axial ligands, that will facilitate a comparison of this coupling to that enabled by the zinc(II)-coordinated pyridyl moiety orthogonal to the porphyrin π system. These compounds further underscore the utility of combining the modular syntheses of donor, acceptor and spacer molecules with Pd-catalyzed carbon-carbon bond forming reactions to elaborate porphyrin-based donor-spacer-acceptor systems. |
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