Two-photon photosensitized production of singlet oxygen in water

被引：176

作者：

Frederiksen, PK

McIlroy, SP

Nielsen, CB

Nikolajsen, L

Skovsen, E

Jorgensen, M

Mikkelsen, KV

Ogilby, PR ^{[1
]}

机构：

[1] Aarhus Univ, Dept Chem, DK-8000 Aarhus, Denmark

[2] Univ Copenhagen, Dept Chem, DK-2100 Copenhagen, Denmark

[3] Riso Natl Lab, Polymer Dept, DK-4000 Roskilde, Denmark

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2005年 / 127卷 / 01期

关键词：

D O I：

10.1021/ja0452020

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Singlet molecular oxygen (a(1)Delta(g)) has been produced and optically detected in time-resolved experiments upon nonlinear two-photon excitation of a photosensitizer dissolved in water. For a given sensitizer, specific functional groups that impart water solubility and that give rise to larger two-photon absorption cross sections are, in many cases, not conducive to the production of singlet oxygen in high yield. This issue involves the competing influence of intramolecular charge transfer that can be pronounced in aqueous systems; more charge transfer in the chromophore facilitates two-photon absorption but decreases the singlet oxygen yield. This phenomenon is examined in a series of porphyrins and vinyl benzenes.

引用

页码：255 / 269

页数：15

共 60 条

[1] Electronic to vibrational energy conversion and charge transfer contributions during quenching by molecular oxygen of electronically excited triplet states [J].