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Decay Kinetics of N,N,N',N'-tetramethylbenzidine Photocations in Frozen Micellar Solution of Cetyltrimethylammonium Bromide

Decay Kinetics of N,N,N',N'-tetramethylbenzidine Photocations in Frozen Micellar Solution of Cetyltrimethylammonium Bromide

T Wolff, S Weber, B Böhm, A Schütz

Photochem Photobiol. 1995 Jul;62(1):82-6.

PMID: 7638273

Abstract:

After UV irradiation of rapidly frozen solutions of N,N,N',N'-tetramethylbenzidine (TMB) in dilute aqueous micellar cetyltrimethylammonium bromide at 80 K, the ESR signal corresponding to the TMB+ cation was detected indicating photoionization. This signal was monitored as a function of time at various temperatures between 80 K and 260 K. On a timescale of a few days the signal decayed to a plateau value that was stable for months. Two distinct second-order processes for the decay from the initial to the plateau value were observed: one prevailing at low temperatures with an activation energy of 0.6 kJ/mol, and one prevailing at T > 220 K with an activation energy of 13 kJ/mol. By means of spin probe investigations the latter process was shown to be connected with a local softening of the region adjacent to the micellar surface.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP366290	N,N,N′,N′-Tetramethylbenzidine		366-29-0	Price

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