Metal-ion permeation in congested nanochannels: the exposure effect of Ag plus ions on the phosphorescent properties of a gold(I)-pyrazolate complex that is confined in the nanoscopic channels of mesoporous silica

• Main Authors: Lintang, Hendrik Oktendy, Kinbara, Kazushi, Yamashita, Takashi, Aida, Takuzo
• Format: Article
• Published: Wiley 2012
• Subjects: Q Science (General)
• Online Access: http://eprints.utm.my/id/eprint/32913/; http://dx.doi.org/10.1002/asia.201200041

An organometallic/silica nanocomposite of a 1D cylindrical assembly of a trinuclear gold(I)pyrazolate complex ([Au3Pz3]) that was confined inside the nanoscopic channels of hexagonal mesoporous silica ([Au3Pz3]/silicahex), emitted red light with a luminescence center at 693 nm upon photoexcitation at 276 nm owing to a AuI?AuI metallophilic interaction. When a film of [Au3Pz3]/silicahex was dipped into a solution of Ag+ in tetrahydrofuran (THF), the resulting nanocomposite material (Ag@[Au3Pz3]/silicahex) emitted green light with a new luminescence center at 486 nm, which was characteristic of a AuI?AgI heterometallic interaction. Changes in the emission/excitation and XPS spectra of Ag@[Au3Pz3]/silicahex revealed that Ag+ ions permeated into the congested nanochannels of [Au3Pz3]/silicahex, which were filled with the cylindrical assembly of [Au3Pz3].