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• W1969788314 abstract "We report direct measurements of the excess polarizability volumes of butadiyne-bridged zinc porphyrin dimers at singly β-to-β (1Zn) and doubly β-to-β (2Zn) positions using the transient dc photoconductivity (TDCP) technique. The excess polarizability volumes of the singlet exciton for 1Zn and 2Zn are 110 and 270 Å3, respectively, while those of the triplet exciton are ∼100 Å3 for both dimers. Our measurements suggest that the singlet exciton is mainly localized on one porphyrin subunit for 1Zn, similar to the case for the porphyrin monomer. While the exciton is fully delocalized on two porphyrin subunits in the case of meso-to-meso linked dimer (3Zn), the extent of exciton localization/delocalization for doubly β-to-β linked dimer lies between those of singly β-to-β and meso-to-meso linked dimers. Electronic structure calculations show that the dramatically different extents of exciton localization/delocalization are the results of frontier orbital coefficients being small at β positions but large at meso positions. Two butadiyne linkages between the porphyrins at β positions (2Zn) clearly facilitate electronic communication between the two porphyrin subunits by virtue of stabilization of cumulenic charge resonance structures through enforced planarity." @default.
• W1969788314 created "2016-06-24" @default.
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• W1969788314 date "2010-02-23" @default.
• W1969788314 modified "2023-10-17" @default.
• W1969788314 title "Excess Polarizability Reveals Exciton Localization/Delocalization Controlled by Linking Positions on Porphyrin Rings in Butadiyne-Bridged Porphyrin Dimers" @default.
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• W1969788314 doi "https://doi.org/10.1021/jp908767x" @default.
• W1969788314 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20178352" @default.
• W1969788314 hasPublicationYear "2010" @default.
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