Abstract
Porphyrins and their isomers possess high affinity towards the formation of complexes with metal cations, but their use for the determination of metal cations is rather limited, due to low selectivity. In this study, we have investigated the unsubstituted hemiporphycene, which shows a highly irregular shape of the inner cavity, and very different reactivity with various metal cations in methanol:water solutions. It was found that hemiporphycene can act as a pH-tunable specific probe for the determination of Zn2+ at pH 8.6 and specific for Cu2+ detection at pH 5.5.
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