pH-switched porphyrin receptor: I. Binding of iodide ions |
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| Authors: | Yu B Ivanova O M Kulikova N Zh Mamardashivili |
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| Institution: | 1.Institute of Solution Chemistry,Russian Academy of Sciences,Ivanovo,Russia |
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| Abstract: | The basic properties of 5,10,15,20-tetra(4-chlorophenyl)porphyrin in the acetonitrile-perchloric acid system at standard temperature
were studied by spectrophotometric titration. The protonation of nitrogen atoms of the tetrapyrrole macrocycle was found to
proceed in two steps to give mono- and diprotonated species. The corresponding ionization constants and concentration ranges
were determined. Diprotonated porphyrin binds efficiently iodide ions; the stability constants of the 1: 1 and 1: 2 complexes
thus formed were determined. |
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