Mechanistic Study of the Photochemical Hydroxide Ion Release from 9-Hydroxy-10-methyl-9-phenyl-9,10-dihydroacridine
作者:Dapeng Zhou、Renat Khatmullin、Janitha Walpita、Nicholas A. Miller、Hoi Ling Luk、Shubham Vyas、Christopher M. Hadad、Ksenija D. Glusac
DOI:10.1021/ja3031888
日期:2012.7.18
The excited-state behavior of 9-hydroxy-10-methyl-9-phenyl-9,10-dihydroacridine and its derivative, 9-methoxy-10-methyl-9-phenyl-9,10-dihydroacridine (AcrOR, R = H, Me), was studied via femtosecond and nanosecond UV-vis transient absorption spectroscopy. The solvent effects on C-O bond cleavage were clearly identified: a fast heterolytic cleavage (tau = 108 ps) was observed in protic solvents, while intersystem crossing was observed in aprotic solvents. Fast heterolysis generates 10methyl-9-phenylacridinium (Acr(+)) and -OH, which have a long recombination lifetime (no signal decay was observed within 100 mu s). AcrOH exhibits the characteristic behavior needed for its utilization as a chromophore in the pOH jump experiment.