Photosensitizers covalently anchored to the silica surface: Modulation of the excited state efficiency through electron transfer from the linking arm or from the surface

Oxidation of sulfides and disulfides under electron transfer or singlet oxygen photosensitization using soluble or grafted sensitizers

“…Owing to our interest in the photooxidation of sulfur compounds, 39,40 the comparative photooxidation of sulfide and disulfide with 9,10-dicyanoanthracene (DCA) and benzophen-one (BzO) as electron transfer photosensitizers was undertaken. A grafted derivative of benzophenone on silica, BzO-Si, already used in other photochemical reactions, 41 was also tested in order to compare its efficiency with that of its soluble counterparts. We had indeed observed, in the case of DCA grafted on silica, a very significant enhancement of the reaction rate and selectivity.…”

Photochemical, Electrochemical and Enzymatic Methods for Ether‐Bond Cleavage

“…[20][21][22][23][24][25] 9,10-Dicyanoanthracene (DCA) has been used as an electron-accepting sensitizer in various systems under homogeneous and heterogeneous conditions, such as for the photocleavage of anisyl ether.…”

“…Sensitizers covalently linked to the surface of silica beads have been selected for investigations of photochemical reactions since 1981. [20][21][22][23][24][25] 9,10-Dicyanoanthracene (DCA) has been used as an electron-accepting sensitizer in various systems under homogeneous and heterogeneous conditions, such as for the photocleavage of anisyl ether. [26] That reaction was then selected as a test reaction for different experiments.…”

Low-temperature reaction of trialkoxysilanes on silica gel: a mild and controlled method for modifying silica surfaces

“…Surface-modified silicas are receiving much attention because of their potential use as chromatographic packings [1][2][3][4][5], supported catalysts [6][7][8][9][10][11][12][13][14][15], or photocatalysts [16][17][18][19][20][21][22][23][24][25][26][27], to mention only some of their numerous applications. Treatments with reactive silanes are among the major methods of modification used to convert silicas into materials carrying covalently bonded functional groups [5,28].…”