Determination of rates of hole transfer from free-base porphyrin to zinc porphyrin across aromatic spacers

Picosecond excited-state dynamics of conformationally constrained triads 1– 4, zinc porphyrin (ZnP)-free-base porphyrin (H 2P)-1,4:5,8-naphthalenetetracarboximide (NIm) bearing aromatic spacers between the ZnP and H 2P moieties, were studied by picosecond time-resolved transient absorption spectrosc...

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Bibliographic Details
Published in:Chemical physics letters 1993-11, Vol.215 (1), p.179-184
Main Authors: Osuka, Atsuhiro, Zhang, Run-Ping, Maruyama, Kazuhiro, Mataga, Noboru, Tanaka, Yoshinori, Okada, Tadashi
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Molecular spectra
Physics
Visible spectra
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Summary:Picosecond excited-state dynamics of conformationally constrained triads 1– 4, zinc porphyrin (ZnP)-free-base porphyrin (H 2P)-1,4:5,8-naphthalenetetracarboximide (NIm) bearing aromatic spacers between the ZnP and H 2P moieties, were studied by picosecond time-resolved transient absorption spectroscopy. Upon photo-excitation in THF, these triads provide long-lived ion pair states (ZnP) +-H 2P-(NIm) − via charge separation between the 1(H 2P) * and NIm followed by a hole-transfer reaction from the (H 2P) + to the ZnP. Rates of this hole transfer, being crucial parameters in determining quantum yields for formation of long-lived ion pair states, were determined. The hole transfer does not occur in less polar benzene solution.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(93)89284-O