Photoinduced electron transfer in arylacridinium conjugates in a solid glass matrix.
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.
Jones
Guilford
G
Photonics Center and Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA.
Yan
Dingxue
D
Hu
Jingqiu
J
Wan
Jiandi
J
Xia
Bing
B
Vullev
Valentine I
VI
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
D000166:Acridines; C026879:sucrose octaacetate; D013395:Sucrose