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Mechanistic and Kinetic Aspects of Photosensitization in the Presence of Oxygen †§
Charles Tanielian,
Robert Mechin,
Rachid Seghrouchni,
Claude Schweitzer,
Corresponding Author
Charles Tanielian
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
*To whom correspondence should be addressed at: Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, 25, rue Becquerel, B.P. 08, F 67087 Strasbourg Cedex, France. Fax: (33) 3 88 13 69 05; [email protected]Search for more papers by this authorRobert Mechin
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
Search for more papers by this authorRachid Seghrouchni
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
Search for more papers by this authorClaude Schweitzer
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
Search for more papers by this authorCharles Tanielian,
Robert Mechin,
Rachid Seghrouchni,
Claude Schweitzer,
Corresponding Author
Charles Tanielian
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
*To whom correspondence should be addressed at: Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, 25, rue Becquerel, B.P. 08, F 67087 Strasbourg Cedex, France. Fax: (33) 3 88 13 69 05; [email protected]Search for more papers by this authorRobert Mechin
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
Search for more papers by this authorRachid Seghrouchni
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
Search for more papers by this authorClaude Schweitzer
Laboratoire de Photochimie, Ecole Européenne de Chimie Polymères et Matériaux de Strasbourg, Strasbourg, France
Search for more papers by this authorFirst published: 01 May 2007
Citations: 4
†
This article was part of the Symposium-in-Print published in October 1999 but could not meet publication schedule.
§
This paper is dedicated to Professor Christopher Foote on the occasion of his 65th birthday and in recognition of his decisive contribution to this subject.
ABSTRACT
Determining whether the first step of photooxygenation is Type I or Type II is a necessary prerequisite in order to establish the mechanism of photodynamic action. But this distinction is not sufficient, because other processes, both consecutive and competitive, commonly participate in the overall mechanism. Thus, in both Type I and Type II reactions, the initial products are often peroxides that can break down and induce free radical reactions. These aspects of photosensitization are discussed and illustrated by sensitizer/substrate systems involving (1) only radical reactions (decatungstate/alkane) and (2) reactions of singlet oxygen occurring in competitive and consecutive processes and possibly followed by radical reactions (methylene blue/2′-deoxyguanosine). Two other previously investigated systems involving, respectively, a Type II interaction followed by radical processes (methylene blue/alkene) and Type II reactions, some of which being competitive or consecutive (rose bengal/alkene), are briefly reconsidered.
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