title: Photoinduced electron transfer between the anionic porphyrins and viologens in titania nanosheets and monodisperse mesoporous silica hybrid films.
abstract: Photoinduced electron transfer between an anionic porphyrin derivative (tetrakis(p-carboxyphenyl)porphyrin; H(2)TCPP(4-)) and an electron accepting methyl viologen (MV(2+)) was investigated in two different nanoscale configurations, i.e., layered titania nanosheet (TNS) photocatalysts and ammonium-functionalized monodisperse mesoporous silica (AMMSS) particles. Cationic MV(2+) intercalated within the TNS interlayers while anionic H(2)TCPP(4-) was accommodated within AMMSS nanocavities to form (MV(2+)-TNS)/(H(2)TCPP(4-)-AMMSS) hybrid films. Upon irradiation with UV light and excitation of the TNS in the (MV(2+)-TNS)/(H(2)TCPP(4-)-AMMSS) hybrid films, the consumption of H(2)TCPP(4-) and the formation of a one-electron reduced MV(2+) (MV(+·)) were simultaneously observed. No consumption of H(2)TCPP(4-) was observed when an electrically insulating poly(styrene) (PS) was also introduced at the interface. These results suggest that photoinduced electron transfer occurred at the interface between the TNS and the AMMSS.
authors.forename: Tatsuto
authors.initials: T
authors.lastname: Yui
authors.forename: Yuka
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Yuri
authors.initials: Y
authors.lastname: Yamada
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Yano
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Fukushima
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Torimoto
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Takagi