- 作者: 周良健 ; 曾惠芬 ; 方泰山
- 作者服務機構: 台灣師範大學化學系
- 中文摘要: The configuration of the lowest excited state of acenaphthenone, S/sub 1/(.pi.,.pi./sup */) or T/sub 1/(n,.pi./sup */), depending on the solvent, dominates photoluminescence. The T/sub 1/(n,.pi./sup */) state in aprotic organic solvents is responsible for the phosphorescence of acenaphthenone. The wavelengths of the phosphorescence measured in benzene are 576nm and 635nm(vibronic) with 3.3*10/sup -4/ quantum efficiency. However, the S/sub 1/(.pi.,.pi./sup */) state in protic solution which dominates the fluorescence emission depending upon acidity is the most distinctive feature of acenaphthenone. The wavelengths of the emissions are 446nm under water solvation with 0.185 quantum efficiency and 538nm with 0.097 quantum efficiency under high acidity. The emission at 446nm is assigned from a H-bonded keto-form excited state, whereas the emission at 538nm is probably due to the excited state of protonated keto-form. The pK/sub a/ value in aqueous solution measured by diminution of fluorescence in basic solutions is 12.5.plmin.0.4.
- 英文摘要: --
- 中文關鍵字: Fluorescence; Phosphorescence; Pka; Excited State; Acenaphthenone
- 英文關鍵字: 螢光;磷光;激發態;???酮