Abstract
A series of porphyrins covalently bound to a single methyl viologen moiety has been synthesised. Fluorescence from the porphyrin is quenched relative to the parent porphyrin; the actual yield depends markedly upon the site of attachment and the length of the chain separating the two reactants. Increasing the number of viologens attached to the porphyrin ring and using non-methylated viologen can increase the fluorescence quenching efficiency. In no case was it possible to detect long-lived redox ion products originating from the fluorescence quencing process.
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