Water-solubilization of alkyloxo(methoxo)porphyrinatoantimony bromides
Literature Information
Jin Matsumoto, Shin-ichiro Tanimura, Tsutomu Shiragami, Masahide Yasuda
In order to develop water-soluble porphyrins, alkyloxo(methoxo)porphyrinatoantimony bromides (alkyl = hexyl (1a), decyl (1b), dodecyl (1c), tetradecyl (1d), octadecyl (1e)) were prepared. 1 had more than 1 mmol dm−3 of solubility in water. From the dependence of the half-width of the bands in the absorption spectra and surface tension on the concentration of 1, it was estimated that 1b–d were present as aggregates in concentrations higher than 10 μmol dm−3. From the NMR analysis in D2O, it was deduced that the alkyloxo ligands of 1 were arranged alternately in the aggregates. The diameter of the aggregates of 1 in water was determined to be around 100 nm by the dynamic light scattering method. Since the solubilities of di(methoxo)tetraphenylporphyrinatoantimony bromide and 5-(4′-decyloxyphenyl)-10,15,20-triphenylporphyrinato(dimethoxo)antimony(V) bromide were low, it was calculated that the long alkyl axial ligands were requisite for the high solubility in water.
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