| Autor: |
G. Abuabara, Sabas, W. Cady, Clyde, B. Baxter, Jason, A. Schmuttenmaer, Charles, H. Crabtree, Robert, W. Brudvig, Gary, S. Batista, Victor |
| Zdroj: |
The Journal of Physical Chemistry - Part C; August 2007, Vol. 111 Issue: 32 p11982-11990, 9p |
| Abstrakt: |
This paper reports visible-light sensitization of TiO2nanoparticles by surface modification with Mn(II)−terpyridine complexes, as evidenced by UV−vis spectroscopy of colloidal thin films and aqueous suspensions. Photoexcitation of the MnII(H2O)3(catechol-terpy)2/TiO2(terpy 2,2‘:6,2‘ ‘-terpyridine) complex, attached to the TiO2surface, leads to interfacial electron transfer within 300 fs as indicated by ultrafast optical pump−terahertz probe transient measurements and computational simulations. Photoinduced interfacial electron transfer is accompanied by Mn(II) → Mn(III) photooxidation. The half-time for regeneration of the Mn(II) complex is ca. 23 s (at 6 K), as monitored by time-resolved measurements of the Mn(II) EPR signal. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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