Three photoresponsive surfactants, C7H15CONHC 6H4N=NC6H4N+Me 3MeOSO3- (1), C8H 17OC6H4N=NC6H4 - CH2N+Me3I- (2), and C16H33OC6H4N=NC6H 4CH2N+Me3I- (3), have been synthesised. The absorption spectrum of 2,6-dichlorophenolindophenol † as a probe for micelle formation indicated that the aggregation mode of these photoresponsive surfactants is affected by photoinduced trans-cis isomerisation of the azobenzene head groups. The catalytic activities of these surfactant aggregates in base-catalysed proton abstraction from benzoin and alkaline hydrolysis of p-nitrophenyl cyclohexanecarboxylate were estimated in the dark and under photoirradiation. It was found that the rate constants in the micellar systems change sensitively in response to photoirradiation. The results imply that photoinduced isomerisation of the head groups leads to a change in the catalytic activity. This is the first example of photocontrol of micellar catalysis.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Perkin Transactions 2|
|Publication status||Published - 1982|
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