2003 年 19 巻 8 号 p. 1199-1202
The association between anionic water-soluble porphyrin and aromatic heterocyclic bases has been investigated to demonstrate the usefulness of a new in situ UV-VIS monitoring method of hydrothermal reactions. Spectral and absorbance changes in the presence of bases were possible to be detected by the new method at temperatures up to 150°C. The association constants (Kass,1) were determined from the absorbance-base concentration curves. The logarithmic values of Kass,1 were proportional to the number of rings of the bases, but this relationship became ambiguous beyond 100°C. This fact indicates that stacking between porphyrin and bases does indeed become weak at high temperatures.
