title: Photoinduced electron transfer in arylacridinium conjugates in a solid glass matrix.
abstract: The photophysical properties of a series of 9-arylacridinium conjugates in solid glass matrices composed of sucrose octaacetate have been determined. The fluorescence of the charge-shift states is significantly enhanced because of the retardation of nonradiative pathways for back-electron transfer. Changes of more than 3 orders of magnitude in back-electron-transfer rates (sucrose octaacetate glass vs conventional solvents at room temperature) were observed. Transient spectra displayed long-lived charge-shift species in the microsecond time regime for thianthrene acridinium conjugates. The rate retardation is associated with slow solvation times for surrounding solvent layers in the solid matrix. The red-edge effect (excitation wavelength-dependent fluorescence) for the arylacridinium ions in solid glass confirms the microheterogeneity of the sucrose octaacetate medium.
authors.affiliation: Photonics Center and Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA.
authors.forename: Guilford
authors.initials: G
authors.lastname: Jones
authors.forename: Dingxue
authors.initials: D
authors.lastname: Yan
authors.forename: Jingqiu
authors.initials: J
authors.lastname: Hu
authors.forename: Jiandi
authors.initials: J
authors.lastname: Wan
authors.forename: Bing
authors.initials: B
authors.lastname: Xia
authors.forename: Valentine I
authors.initials: VI
authors.lastname: Vullev
mesh_terms: D000166:Acridines / Q000737:chemistry*; D040761:Biomimetic Materials / Q000737:chemistry*; D004579:Electron Transport; D005898:Glass / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D044367:Phase Transition; D010777:Photochemistry; D013395:Sucrose / Q000031:analogs & derivatives / Q000737:chemistry
chemical_list: D000166:Acridines; C026879:sucrose octaacetate; D013395:Sucrose