Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1669 - 1676 (1985)
Update date:2022-08-03
Topics:
Arce, Rafael
Kevan, Larry
Continuous 337 nm laser excitation of N,N,N',N'-tetramethylbenzidine (TMB) in 0.1 mol dm-3 sodium dodecyl sulphate micelles produces monophotonic ionization of the molecule.A study of the photoionization process has resulted in the following new results: (1) the radical-cation quantum yield decreases with adsorbed light because of its spectral overlap with TMB and its simultaneous photodestruction during irradiation, (2) partial regeneration of the TMB absorption band after radical-cation decay suggests that a principal mode of radical decay is through a disproportionation reaction, (3) the photoionization yield is affected by the degree of protonation of TMB, increasing with increasing bulk pH, and (4) diprotonated TMB, TMBH22+, photodecomposes into TMB2+.
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