title: Metal-ion permeation in congested nanochannels: the exposure effect of Ag+ ions on the phosphorescent properties of a gold(I)-pyrazolate complex that is confined in the nanoscopic channels of mesoporous silica.
abstract: An organometallic/silica nanocomposite of a 1D cylindrical assembly of a trinuclear gold(I)-pyrazolate complex ([Au(3)Pz(3)]) that was confined inside the nanoscopic channels of hexagonal mesoporous silica ([Au(3)Pz(3)]/silica(hex)), emitted red light with a luminescence center at 693 nm upon photoexcitation at 276 nm owing to a Au(I)-Au(I) metallophilic interaction. When a film of [Au(3)Pz(3)]/silica(hex) was dipped into a solution of Ag(+) in tetrahydrofuran (THF), the resulting nanocomposite material (Ag@[Au(3)Pz(3)]/silica(hex)) emitted green light with a new luminescence center at 486 nm, which was characteristic of a Au(I)-Ag(I) heterometallic interaction. Changes in the emission/excitation and XPS spectra of Ag@[Au(3)Pz(3)]/silica(hex) revealed that Ag(+) ions permeated into the congested nanochannels of [Au(3)Pz(3)]/silica(hex), which were filled with the cylindrical assembly of [Au(3)Pz(3)].
authors.affiliation: Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia. hendrik@ibnusina.utm.my
authors.forename: Hendrik O
authors.initials: HO
authors.lastname: Lintang
authors.forename: Kazushi
authors.initials: K
authors.lastname: Kinbara
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamashita
authors.forename: Takuzo
authors.initials: T
authors.lastname: Aida
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D008163:Luminescent Measurements; D008670:Metals / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D016062:Porosity; D011720:Pyrazoles / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D007477:Ions; D008670:Metals; D011720:Pyrazoles; D012834:Silver; C031280:pyrazole; D006046:Gold; D012822:Silicon Dioxide