Determination of rates of hole transfer from free-base porphyrin to zinc porphyrin across aromatic spacers
✍ Scribed by Atsuhiro Osuka; Run-Ping Zhang; Kazuhiro Maruyama; Noboru Mataga; Yoshinori Tanaka; Tadashi Okada
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 489 KB
- Volume
- 215
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
Picosecond excited-state dynamics of conformationally constrained triads 14, zinc porphyrin (ZnP)-free-base porphyrin (H,P)-1,4: $8~naphthalenetetracarboximide (NIm) bearing aromatic spacers between the ZnP and HIP moieties, were studied by picosecond time-resolved transient absorption spectroscopy. Upon photo-excitation in THF, these triads provide long-lived ion pair states (ZnP)+-HsP-(NIm)-via charge separation between the ' (H,P)* and NIm followed by a hole-transfer reaction from the (H2P) + to the ZnP. Rates of this hole transfer, being crucial parameters in determining quantum yields for formation of longlived ion pair states, were determined. The hole transfer does not occur in less polar benzene solution.