Formation and photocatalytic properties of nanocomposite films containing both tetracobalt Dawson-derived sandwich polyanions and tetracationic porphyrins.
Films based on electrostatic interactions between tetracationic zinc porphyrins, ZnOEP(py)(4)(4+) or ZnTMePyP(4+), and the tetracobalt Dawson-derived sandwich polyanion αββα-[Co(4)(H(2)O)(2)(P(2)W(15)O(56))(2)](16-) are formed by the so-called layer-by-layer method. These films have been characterized by UV-visible absorption spectroscopy, atomic force microscopy and electrochemistry. The composition of the film was measured by X-ray photoelectron spectrum (XPS). The XPS data confirm the presence of the expected elements. The photocatalytic properties of these films have been also studied for the reduction of silver and gold ions. Indeed, in these systems, porphyrins can be excited by visible light and then play the role of photosensitizers able to give electrons to POM known to be good catalysts. Silver nanowires and gold nanosheets have been obtained.
Laboratoire de Chimie Physique, Groupe TEMiC, UMR 8000 au CNRS, Université Paris-Sud (11), Bâtiment 349, F-91405 Orsay Cedex, France.
Delphine
D
Schaming
Rana
R
Farha
Hualong
H
Xu
Michel
M
Goldmann
Laurent
L
Ruhlmann
D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D004563:Electrochemistry; D006046:Gold / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D008958:Models, Molecular; D008968:Molecular Conformation; D053761:Nanocomposites / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry*; D010539:Permeability; D055668:Photochemical Processes; D011166:Porphyrins / Q000737:chemistry*; D020005:Propanols / Q000737:chemistry; D011791:Quartz / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D013057:Spectrum Analysis; D055672:Static Electricity; D017973:Tungsten Compounds / Q000737:chemistry
D008670:Metals; D009942:Organometallic Compounds; D011166:Porphyrins; D020005:Propanols; D017973:Tungsten Compounds; D011791:Quartz; D003035:Cobalt; D012834:Silver; D012965:Sodium Chloride; D006046:Gold